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Description of the menu options

ELSA LANCOM Business

R75

LAN-config

This option allows you to define whether remote configuration from the LAN side is
possible (

On

), is not possible (

Off

), or is possible only in read mode (

Read

). The default

setting for this option is

On

.

WAN-config

This option allows you to define whether remote configuration from the WAN side is
possible (

On

), is not possible (

Off

), or is possible only in read mode (

Read

). The default

setting for this option is

Off

.

Password-
required

This specifies whether a new password should be requested every time a remote
configuration is begun (

On

), or the password request should be suppressed (

Off

). The

default setting for this option is

On

.

Farconfig-(EAZ-
MSN)

This subscriber number permits remote configuration via PPP. If no number is specified
here, remote-configuration calls will be accepted on all numbers.

Maximum
connections

This option allows you to display the maximum number of remote configuration sessions
that can occur simultaneously for the device.

Config-aging-
minute(s)

If data transmission halts during a remote configuration session, e.g. because the user is
no longer entering data, the device automatically releases the connection at the end of
the time period specified here. Possible settings are from 1 to 99 minutes; the default
setting is 5 minutes.

Login-errors

This entry specifies the number of failed attempts allowed before the log-in block is
activated. An empty password (simply pressing <ENTER> at the password prompt) is not
considered an attempt and therefore does not activate the block.

The default value is 5. A lower value may cause the log-in block to be activated with only
one access on an older ELSA LANconfig! In this case obtain an updated ELSA LANconfig
version over our online media.

Lock-minutes

This entry has two meanings. It indicates how long the access is blocked if the log-in
block has been activated. It also sets the period after which the device forgets all prior
login errors.

Language

This option allows you to select whether you will use the German or English version of
the software for performing the configuration.

Config-aging-minute(s)

Time limit for remote configuration connections

Login-errors

Number for failed log-in attempts before the log-in block is
activated

Lock-minutes

Duration of block and period until old log-in errors are for-
gotten

Display contrast

Language

Configuration language

/Config-module

Configuration module settings

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Содержание LANCOM Business LC-4X00

Страница 1: ...Manual ELSA LANCOM TM Business No 20857 0999...

Страница 2: ...esult of technical development ELSA is DIN EN ISO 9001 certified The accredited T V CERT certification authority has confirmed ELSA conformity to the worldwide ISO 9001 standard in certificate number...

Страница 3: ...ion examples Manual Extended description of the router functions and operating modes CD containing electronic documentation Reference manual complete description of the menu Our online services Intern...

Страница 4: ......

Страница 5: ...tion with the DHCP server 15 Beginning inband configuration using ELSA LANconfig 15 Start up inband configuration using telnet 16 Remote access configuration using a dial up connection 16 This is what...

Страница 6: ...nterface settings 41 LANCAPI interface settings 41 Layer list 42 Round robin list 43 Channel list 43 PPP list 44 Script 44 Call acceptance 45 Number list 45 Leased lines and backup procedures 45 Setti...

Страница 7: ...erver 79 DNS server 81 What does a DNS server do 81 Setting up the DNS server 82 NetBIOS proxy 84 To the point What is NetBIOS 84 Handling of NetBIOS packets 85 Which preconditions must be fulfilled 8...

Страница 8: ...f the menu options on CD only R1 Status R3 Display and keyboard R4 Status Connection R5 Status Current time R5 Status Operating time R5 Status WAN statistics R6 Status LAN statistics R8 Status PPP sta...

Страница 9: ...ule R77 Setup DNS module R78 Setup Time module R79 Firmware R80 Other R82 Novell SAP numbers on CD only R83 TCP IP ports on CD only R87 ELSA LANCOM Business internal on CD only R91 Script processing R...

Страница 10: ...Content ELSA LANCOM Business X...

Страница 11: ...ch data can be exchanged between the computers This path is available in the form of an ISDN connection Connection to the Internet is a particularly widespread form of network connection If the local...

Страница 12: ...ion together with sophisticated filter mechanisms keeps connections costs low Of course it is also possible to operate a combination of leased lines and dial up connections Teleworking using remote ac...

Страница 13: ...nection The ELSA LANCOM is connected to the S0 interface s of an ISDN Basic Rate Interface in point to multipoint configuration multi device terminal or in point to point configuration system terminal...

Страница 14: ...lows you to log and save the messages on the PC for further processing Statistics The comprehensive statistics function lets you keep track of your router These statistics give you all the information...

Страница 15: ...tion CLIP the router offers protection against unauthorized access to the company network by means of a callback function which only permits a connection to be established to previously defined teleph...

Страница 16: ...eed to add hardware to the workstations This does away with the cost of equipping workstations with ISDN adapters or modems The office communications software simply needs to be loaded onto the indivi...

Страница 17: ...r networks in order to directly provide the correct route for requests for known computer names The DNS server can also access the name and IP information from the DHCP server and the NetBIOS module T...

Страница 18: ...essages and scroll through the multi line display The precise function of each button for the ELSA LANCOM s various operating modes is described in chapter Configuration modes Power Msg This LED flash...

Страница 19: ...tion ELSA LANCOM Business 9 LAN Link green Connection to LAN is established and ready LAN FDpx green Router is transmitting and receiving data simultaneously LAN Fast green ELSA LANCOM is operating at...

Страница 20: ...s factory defaults after holding for approx 5 seconds Connection for power supply unit On Off switch S0 status Off Bus not activated flashing rapidly Bus with D channel active no TEI assigned D chann...

Страница 21: ...eration of this device in a manner not in accordance with the directions or within the proximity of powerful transmitters may lead to its temporary failure These limits are designed to provide reasona...

Страница 22: ...Introduction ELSA LANCOM Business 12...

Страница 23: ...ne or similar remote configuration What is the difference between these On one hand the availability of the units Configuration via outband is always available Inband configuration is not possible how...

Страница 24: ...al area network but not on the serial ports New devices can be found with Device Find Search at all serial ports ELSA LANconfig displays new routers in the list by their devices types If your device i...

Страница 25: ...s already a computer with the address XXX XXX XXX 254 on your network you should assign a new address to the device using the outband configuration method before you install it on the LAN Alternativel...

Страница 26: ...clear term at any time to call up context sensitive help Start up inband configuration using telnet Start up inband configuration using telnet with the command telnet 10 1 80 125 Telnet will then esta...

Страница 27: ...ce to which the ELSA LANCOM is connected If you wish you can also enter the time period after which an idle connection is to be disconnected automatically ELSA LANconfig now automatically generates a...

Страница 28: ...to a different protocol after the first configuration run Then the device will no longer take calls on the dial up connection using the PPP settings The solution to this is to agree upon a special ca...

Страница 29: ...Configuration modes ELSA LANCOM Business 19 Alternatively enter the following command passwd You will then be prompted to enter and confirm a new password...

Страница 30: ...resets the value set IP address 192 110 120 140 sets a new IP address insert a space between all entries in table rows An leaves the entry unchanged set setup name GLASGOW assigns the name GLASGOW to...

Страница 31: ...the upload Immediate The first option loads the new firmware and activates it immediately This can result in the following situations The new firmware is loaded successfully and works as desired Then...

Страница 32: ...e date of the firmware in the description and offers to upload the file The firmware you already have installed will be replaced by the selected release by clicking Open You also have to decide whethe...

Страница 33: ...ide the user with information about the problem In this instance the device will not boot but will continue to operate with the previous firmware version until the next time it is switched off and the...

Страница 34: ...private MIB included in the product as a separate file are supported This MIB must be loaded and translated by an SNMP manager HP OpenView for example to allow you to manage a router completely using...

Страница 35: ...very limited since the data the MIB IDs and the communities are not encrypted in the UDP data blocks of requests and responses as they are transmitted Deleting rows in tables using SNMP SNMP itself ha...

Страница 36: ...onfiguration menu under setup SNMP module IP Trap Table You can enable and disable the transmission of trap messages using the setup SNMP module Send Traps switch SNMP and ELSA LANmonitor The followin...

Страница 37: ...stem from the configuration of your own ELSA LANCOM or that of the remote site The trace outputs are slightly delayed behind the actual event but are always in the correct sequence This will not usual...

Страница 38: ...ress Resolution Protocol Script Script processing IP masquerading Processes in the masquerading module DHCP Dynamic Host Configuration Protocol D channel Trace on the D channel of the connected ISDN b...

Страница 39: ...you should activate the ELSA LANmonitor option With ELSA LANmonitor you can only monitor those devices that you can access inband via the local network This computer must also have the TCP IP network...

Страница 40: ...n being established on one channel and the name of the remote site being called As soon as the connection is established a plus sign against the B channel entry indicates that further information on t...

Страница 41: ...e this virtual display to remain in the foreground on your monitor If you would like a log of the LANmonitor output in file form select Options from the View menu and go to the Log tab Enable logging...

Страница 42: ...Configuration modes ELSA LANCOM Business 32...

Страница 43: ...st router Alongside the description of the individual points we will also give you instructions to support you as you configure your device Detailed sample configurations can be found in the Workshop...

Страница 44: ...oo The following entries are provided in the ELSA LANconfig for configuring login barring in the Management configuration area on the Security tab or under Setup Config module in the menu Lock configu...

Страница 45: ...It is an obvious requirement for identification that the corresponding information is also sent by the caller Verification of name The name of the remote station can also be transferred in PPP connect...

Страница 46: ...te sites with unknown numbers are denied access You can use call numbers as a security measure with any B channel protocol layers Callback The callback function offers a special form of access privile...

Страница 47: ...section on the Routing tab or in the Setup IP router module IP routing table menu For further information see the IP Routing IP masquerading section Call charge management The capability of the router...

Страница 48: ...hut down automatically The budgets will not be reset to permit the establishment of connections until the current period has elapsed Needless to say the administrator can reset the budgets at any time...

Страница 49: ...ameters are stored in a variety of lists the interaction of which permits the correct connections The following sections introduce the lists and briefly describe the parameters they contain describe t...

Страница 50: ...llowing options Normal callback Callback using the fast ELSA process Callback after name verification Await the callback from the remote station using the fast ELSA process Interface settings The inte...

Страница 51: ...eous connections Enable this option if it should be possible for both B channels of the connection to establish parallel connections to different remote stations Suppression of own phone number Enable...

Страница 52: ...ings to be used for data transfer to other devices Specifically they are Layer name The protocol settings will be saved under this name In the name list select the settings with the layer name for the...

Страница 53: ...ion section on the Remote Sites tab or under Setup WAN module Channel list during telnet or terminal sessions Use the channel list to determine the minimum and maximum number of B channels to be used...

Страница 54: ...sed when establishing a connection with the remote station IP NetBIOS IPX Protocols that may be used over this connection Auth Authentication process that the router should request from the remote sta...

Страница 55: ...transferred to the remote station by name or number The call will be accepted if one of the two checks was successful Number list The number list in the ELSA LANconfig can be found in the Communicati...

Страница 56: ...able Specify the Grp0 protocol in the interface table The YV flag must be set to Off for connections to a single remote station or to On for multiple remote stations For connections with one B channel...

Страница 57: ...ally always established with the default remote station i e with the layer entered for the default remote station If no default remote station is available or no layer entry is available for the remot...

Страница 58: ...oviders offer data services via GSM telephones as a standard part of their service agreements In some cases these must be enabled separately and are subject to additional charges Some providers also d...

Страница 59: ...ed control protocols LCP IPCP IPXCP CCP which are contained in PPP in order to ensure successful data transfer where possible What is PPP used for It is best to use the point to point protocol in the...

Страница 60: ...one of the network layers Terminate phase In the final phase the line is cleared when the logical connections for all protocols are cleared PPP negotiation in the ELSA LANCOM The progress of a PPP neg...

Страница 61: ...s of the connection according to CHAP This time is entered in minutes The time must be set to 0 for remote stations using Windows 95 Windows 98 or Windows NT Retries Number of retries for the check at...

Страница 62: ...is configured in the PPP list for each individual connection The intervals at which LCP requests should be made are set by the entries in the Time and Retries fields along with the number of retries...

Страница 63: ...also receives information on DNS servers at the provider in addition to the IP address during PPP negotiation The ELSA LANCOM is only known by its internally valid intranet address on the local area...

Страница 64: ...list the call is initially accepted as the DEFAULT remote sta tion and the callback is negotiated during the callback protocol negotia tion A charge of one unit is incurred for this Name A protocol ne...

Страница 65: ...be set to Off during configuration with a terminal program or via telnet Choose select callback number The remote station is called back after the name has been verified The callback entry must have...

Страница 66: ...cified by Windows and cannot be shortened Fast ELSA callback This fast ELSA specific process is ideal if two ELSA LANCOM are to communicate with one another via callback The caller who would like to b...

Страница 67: ...a given period of time it will attempt to add further channels until the number specified as Maximum in the channel list has been reached Either the channels specified in the channel list or random fr...

Страница 68: ...minimum channel results in static bundling whereas a difference between the minimum and maximum number of channels permits dynamic channel bundling Use the entry for the Y connection in the interface...

Страница 69: ...various networks does not clash and that one network remains invisible to the others These formats are determined by the binding belonging to a unique network number on this cable You must provide the...

Страница 70: ...n or routed using the Filter property The Route property transmits the packets if a connection to the remote station concerned is active or a free channel is available for the establishment of an addi...

Страница 71: ...o a destination network for instance RIP tables can hold 64 entries and SAP tables 128 If each new packet updates the tables it stands to reason that the old entries must also disappear at some stage...

Страница 72: ...s connections constantly being established and thus saves charges The router will attempt to reach a remote station again with ever increasing wait times if the first attempt is unsuccessful The wait...

Страница 73: ...he other routers of all the routes paths to the other networks known to it using the split horizon principle This includes the entries from its own routing table and all routes which the router has de...

Страница 74: ...s to these requests as follows IPX watchdogs receive no response The computers are logged off after a time specified on the server IPX and SPX watchdogs can be responded to locally This procedure is k...

Страница 75: ...found The routing table can be found in the ELSA LANconfig in the TCP IP configuration section on the Routing tab or in the Setup IP router module IP routing table menu This then is how an IP routing...

Страница 76: ...ur provider as entered in the TCP IP configuration section on the General tab or in the Setup TCP IP module menu This address will be used for the connection and masquerading For further information s...

Страница 77: ...and may be selected freely within certain ranges The router can check the source and destination ports of data packets using the TCP or UDP protocols It can then deduce the purpose of the data from th...

Страница 78: ...enable the Use Proxy ARP option in LANconfig in the TCP IP configuration section on the Routing tab or in the Setup IP router module menu for other configuration modes The router becomes a proxy for...

Страница 79: ...sent on from here to the router which is actually responsible Dynamic routing with IP RIP In addition to the static routing table ELSA routers also have a dynamic routing table containing up to 128 en...

Страница 80: ...IP packets it incorporates them in its dynamic routing table which looks something like this What do the entries mean IP addresses and network masks identify the destination network the distance is ta...

Страница 81: ...support Routers which do not support the Routing Information Protocol are also occasionally present on the local network These routers cannot recognize the RIP packets and look on them as normal broad...

Страница 82: ...mputers on the network have valid Internet addresses and are masked behind the router s fixed address IP address with an incomplete network mask e g 255 255 255 248 You have several registered IP addr...

Страница 83: ...ation port is specified with the intranet address of for example the FTP server on a service table to achieve this When accessing the Internet from the intranet on the other hand the router itself mak...

Страница 84: ...as the DNS server for the workstation computers is sufficient to enable you obtain the name assignment This procedure also automatically updates the address of the DNS server The router always receiv...

Страница 85: ...connect the new router to a network without other DHCP servers and switch it on The router then interacts with ELSA LANconfig using a wizard and handles all of the address assignments in the local net...

Страница 86: ...ng the pool From the address used IP or intranet address and the associated network mask the DHCP server determines the first and last possible IP address in the local network as a start or end addres...

Страница 87: ...er is specified in the relevant fields the router passes its own IP address as a DNS address This address is determined as described under IP address assignment The router then uses DNS forwarding als...

Страница 88: ...configuration tab the Enable WINS Resolution option must also be activated if you wish to use Windows networks via IP with name resolution via NBNS In this case the DHCP server must also have an NBNS...

Страница 89: ...P operation Configuration using ELSA LANconfig and the wizards The ELSA LANconfig includes a wizard to help you with the required settings Connect the unconfigured router to your local network using a...

Страница 90: ...dows NT in the Workshop chapter For instructions on how to install ELSA LANconfig please refer to the Installation Guide Install the ELSA LANconfig on a computer in the network Start the ELSA LANconfi...

Страница 91: ...required for Internet communications to return the correct IP address for a request such as www elsa com for example However it s also useful to be able to clearly associate IP addresses to computer...

Страница 92: ...searches in its own static DNS table for suitable entries If the address cannot be found in the DNS table it searches the dynamic DCHP table The use of DHCP information can be disabled if required If...

Страница 93: ...r example if would like to access the mail server at your headquarters name mail yourdomain com IP 10 0 0 99 via the router from a branch office enter cd setup DNS module DNS table set mail yourdomain...

Страница 94: ...r list If your LAN uses subnetting you can also apply filters to individual departments by carefully selecting the IP addresses and subnet masks The IP address 0 0 0 0 stands for all computers in the...

Страница 95: ...connection of Microsoft Networks is thus possible without a server as a result of this simple realization of the NBNS The computers in the networks to be interconnected thus publicize their names and...

Страница 96: ...t Networks to be interconnected Network protocol NetBIOS is completely independent of the transport protocol used NetBIOS network data can thus be transferred using the NetBEUI NetBIOS Extended User I...

Страница 97: ...ch to the Identification tab The name of the workstation must be unique That applies to all Microsoft Networks and all groups that you intend to connect using NetBIOS within these networks Names also...

Страница 98: ...made correctly the local computer must appear with its name in the Network Neighborhood Linking two Microsoft Networks via ISDN Two Microsoft Networks can be interconnected once these preparations hav...

Страница 99: ...ion to the remote station should be dialed up to exchange name information after switching on the NetBIOS module The NT domain parameter can generally be left blank in the case of Windows 95 or 98 net...

Страница 100: ...the remote station is realized from the IP pool Also create an entry for the remote stations in the NetBIOS IP routing table cd Setup NetBIOS module Remote table set nhamel ras workstation Be sure to...

Страница 101: ...Microsoft Network via RAS is somewhat different These are the two fundamental differences to LAN LAN interconnection A host list with the computers in the Microsoft Network is not available on the di...

Страница 102: ...or office communications as well as providing you with instructions that are important for installing the individual components ELSA LANCAPI What are the advantages of LANCAPI Above all the use of LAN...

Страница 103: ...s icon opens a status window that permits current information on the LANCAPI to be displayed at any time Configuring the LANCAPI client The configuration of the LANCAPI client is used to determine whi...

Страница 104: ...when configuring the LANCAPI server What call numbers from the telephone network should LANCAPI respond to Which of the computers in the local network should be able to access the telephone network vi...

Страница 105: ...telephony service Do not change this setting unless this port is already in use by a different service in your LAN If you do not wish all the computers in the local network to be able to access the L...

Страница 106: ...can be used to ensure the permanent availability of the fax function for example Using the LANCAPI Two options are available for the use of the LANCAPI You may use software which interacts directly wi...

Страница 107: ...es These providers also provide the option of the preselection of a given network or the placement of long distance calls on a dial around basis without a contract with a specific provider The prefix...

Страница 108: ...ical ones The first entries in the LCR table will then appear as follows These three entries mean that all connections to Bristol or other numbers with the prefix 0117 on weekends will be made using t...

Страница 109: ...not be rerouted Perhaps a large number of your ISDN connections go to the same area codes If most of your remote stations are in Bristol for example you can reach these numbers using a specific provi...

Страница 110: ...ral network prefixes separated by semicolons the LCR will automatically try the next prefix if the current one is busy On which days and what times should the routing be active Please note that time b...

Страница 111: ...SDN either when switched on or during each call establishment In ELSA LANconfig switch to the Date Time tab in the Management configuration section Activate the option for automatic synchronization at...

Страница 112: ...Operating modes and functions ELSA LANCOM Business 102...

Страница 113: ...as the specification of your own call numbers are repeated each time they appear in the examples so that each individual section forms a complete description This means that descriptions will be incl...

Страница 114: ...the practical uses of the devices will introduce you to applications involving the Internet The first example shows a company seeking to use a router on its network to connect up to the Internet This...

Страница 115: ...ers use addresses from a protected range addresses in the tens for example The entire local area network is now hidden by IP masquerading behind the registered IP address of the router This process ha...

Страница 116: ...assigned as used in the example We recommend that you create a table such as this for each application It will assist you in your work of configuring troubleshooting and when requesting support inform...

Страница 117: ...fy in the interface table configuration area Communication General tab the call number for incoming and outgoing calls in the Router interface list cd Setup WAN module Router interface list S0 1 12345...

Страница 118: ...the IP address and the IP netmask are empty because in this example the router obtains the IP address dynamically from the ISP If on the other hand there are IP addresses available which are register...

Страница 119: ...DNS server which finally determines the IP address for this name e g 168 192 156 100 and returns to the workstation computer via the router The router will then send all the packets for this IP addre...

Страница 120: ...twork will be sufficient if a leased line connection is not required Set your router to callback for the service provider so that the ISP is not charged for the connection to your Web server With the...

Страница 121: ...ically use the DEFAULT layer for this To ensure that the leased line connection uses another layer create a new layer in the layer list and set it up according to your requirements in the layer lists...

Страница 122: ...he Intranet so that it can be found in its own TCP IP network It receives this as part of the entry for the Intranet address together with the associated netmask configuration area TCP IP General tab...

Страница 123: ...t be enabled since this IP address falls within the service provider s own address range cd Setup IP router module set Proxy ARP ON The web server is made visible on the Internet by an entry in the se...

Страница 124: ...for this IP address by the default route to the Internet since this address was not found in the local area network Company web site on the Internet If an Internet subscriber somewhere in the world s...

Страница 125: ...other coupled networks not just those of the router An example of the task In this example the central office has six branches A small router that connects to the ELSA LANCOM Business in the central o...

Страница 126: ...ers for each of the networks you would like to connect The wizard is also used once for each of the branch office routers Step by Step What settings are made in the routers In principle the settings a...

Страница 127: ...orrespondingly receive their own call numbers New entries in the name list configuration area Communication Remote Sites tab with identification of the remote stations and the call numbers with select...

Страница 128: ...ven below The call numbers of the other router interfaces in the central office which have not previously been entered in the name list are entered here in the routers of the branches cd Setup WAN mod...

Страница 129: ...IP module cd Setup TCP IP module RoundRobin list set Intranet address 10 1 130 101 set Intranet netmask 255 255 255 0 The routers in the branch offices receive the IP addresses 10 131 1 100 to 10 136...

Страница 130: ...lso need to know that the router is the switching center for the other networks For this purpose the Intranet address of the router is entered as default gateway for the workstations and servers These...

Страница 131: ...02 00030003 00040004 Binding 802 3 SNAP SNAP 802 3 802 3 Device name Example_Inc Glasgow London Manchester Leeds Dialup remote 4711100 4711200 4711300 4711400 1234561 1234562 1234563 1234564 WAN netwo...

Страница 132: ...the specific call number of the router in the central office configuration area Communication General tab cd Setup WAN module Router interface list S0 1 4711100 S0 2 4711200 S0 3 4711300 S0 4 4711400...

Страница 133: ...area IPX SPX General tab Setup IPX module LAN config set Network 00000009 set Binding 802 3 Head office s network has one server If you do not know the network number you can have this determined auto...

Страница 134: ...chanism is found in Exponential Backoff The entry for the network in the Glasgow branch for example is as follows cd Setup IPX module WAN config Routing table set Example_Inc 00000101 802 3 Route On T...

Страница 135: ...example of the task Staff using remote access will have a workstation computer with an ISDN terminal adapter or an ISDN card at home Some field staff members also dial into the company network using n...

Страница 136: ...g call number since field service employees at least sometimes will require access to the company network from different locations It is therefore not possible to assign call number recognition to a l...

Страница 137: ...y process and enable the routing of IP and NetBIOS packets via this connection cd Setup WAN module PPP list Tele_01_ISDN PAP Remote 0 0 Tele_01 IP NTB Tele_01_GSM PAP Remote 0 0 Tele_01 IP NTB You may...

Страница 138: ...s own logical network cd Setup IP router module set Proxy ARP ON Now switch the IP router on and the router is ready to receive calls from field staff cd Setup IP router module set operating on What s...

Страница 139: ...Workshop ELSA LANCOM Business 129 TCP IP selected as the network protocol Assignment of IP address and name server address checked IP header compression unchecked...

Страница 140: ...now access the shared server and Windows networks on the TCP IP network He can find this server by clicking on Start Find Computer in the Windows Start menu for instance The least cost router In this...

Страница 141: ...directly from the PC they use ELSA RVS COM via the LANCAPI Of course the office in this chapter s example also needs to make connections as cheaply as possible when faxing accessing the Internet or e...

Страница 142: ...It is best to enter them for the next two or three years while you are at it Now we get to the core of the matter The entries in the LCR table For some entries there are several network codes These ar...

Страница 143: ...ng to the local zone The following entries are now added Prefix Dial around number Days Time Fallback 00 01015 01028 Every day 0 00 am 11 59 pm YES Prefix Dial around number Days Time Fallback 02408 E...

Страница 144: ...you cannot use the ELSA LANconfig configuration tool you can achieve the same results by configuring the device via telnet or a terminal program with the following commands 02473 Every day 0 00 am 11...

Страница 145: ...ays starts Stop Time at which validity of the entry on the defined days ends Number list Network code of the dial around provider Fallback Automatic fallback to your own telephone company if all dial...

Страница 146: ...Workshop ELSA LANCOM Business 136...

Страница 147: ...ers fax class 1 Line control Automatic callback with or without call establishment line on demand dynamic channel bundling short hold mode round robin dialing fast callback dial backup for leased line...

Страница 148: ...entation and ELSA LANCOM CD ROM Software ELSA LANconfig ELSA LANmonitor ELSA LANCAPI TFTP client ELSA RVS COM office communications suite ELSA ZOC terminal pro gram LapLink for Windows remote maintena...

Страница 149: ...The warranty period for ELSA products is six years Excepted from this warranty period are ELSA color monitors and ELSA videoconferencing systems with a warranty period of 3 years This period begins at...

Страница 150: ...o entitlement to additional claims such as any refund in full or in part Compensation claims regardless of the legal basis are excluded This does not apply if e g injury to persons or damage to privat...

Страница 151: ...irements relating to the Niederspannungs Richtlinie 73 23 EWG Low Voltage Directive 73 23 EEC ISDN Vorschrift 97 346 EG ISDN Directive 97 346 EEC EMV Richtlinie 89 336 EWG EMC Directive 89 336 EEC Zur...

Страница 152: ...Appendix ELSA LANCOM Business 142...

Страница 153: ...nnel 64 kbps an ISDN basic rate interface has one D channel and two B channels Basic Rate Interface ISDN subscriber connection with two bearer channels 64 kbps and a signal channel 16 kbps The S0 inte...

Страница 154: ...Z The EAZ is the terminal device selec tion number used in the 1TR6 protocol to dis tinguish terminal equipment connected to the same ISDN base rate interface Callers will attach this digit at the end...

Страница 155: ...component within an IPX network IPX watchdog Packets sent at specific in tervals by the server to monitor a workstation If the workstation does not answer it is auto matically logged off ISDN Integra...

Страница 156: ...group of computers and termi nal systems that are connected by communi cations lines to share information and resources NETX NETX NetWare shell This pro gram provides an interface between applica tion...

Страница 157: ...nts Many network operating systems use a client server architecture i e a specific very powerful computer serves data and programs to a large number of clients workstations Short hold mode A connectio...

Страница 158: ...mily developed by the DoD Department of Defense in the early 1970s for the secure interconnection of heter ogeneous Wide Area Networks The two foundations of this protocol family are IP which implemen...

Страница 159: ...the HDLC transfer process in the ISDN B channel XModem XModem is a transfer protocol with automatic error recognition and correc tion Data transfer is performed in 128 byte blocks If a transfer error...

Страница 160: ...Glossary ELSA LANCOM Business 150...

Страница 161: ...30 connection status 4 Backoff R53 BACP 3 Barring 34 B channel protocol 36 B channel protocols R43 Binding R50 Boot system R82 Brute force 5 34 Buffers R48 Buttons 8 C Cache R60 Call charge informati...

Страница 162: ...s of the week 98 DDI numbers R43 Default layer 18 Default route R63 Destination network R61 Destination port R63 R64 Device name R41 Device names R41 DHCP 6 74 R70 DHCP for WINS resolution 78 DHCP mod...

Страница 163: ...Firmware 6 R80 Firmware upload 22 R80 using TFTP 23 with LANconfig 22 with terminal program 22 Fixed connections setting up 46 Flash ROM 21 Flash ROM memory 5 G Gateway 37 74 77 Group table R73 Group...

Страница 164: ...ting table 59 IPX watchdog R50 IPX watchdogs 64 ISDN cable 3 ISDN dial up connections 37 ISDN layers R43 ISDN time 5 R5 K Key 51 R45 L LAN Coll 8 LAN configuration R75 LAN connection 3 LAN filter tabl...

Страница 165: ...Name information 85 Name list R41 Name server R59 Name verification R46 Names 85 Naming IP addresses 59 NAT 35 37 71 NBNS 85 R60 NBNS backup R60 NBNS server 74 77 78 Neighboring local exchanges 99 Ne...

Страница 166: ...lient 13 17 PPP connection 13 18 PPP LCP Extensions 56 PPP list 35 PPP negotiation 18 R58 Prefix 97 Preselection 97 Priority control 96 Prohibited address ranges R62 Prohibiting domains 84 Propagated...

Страница 167: ...R42 Special prefixes 99 Speed R44 Split horizon 62 Spoofing R55 R57 SPX watchdog R51 SPX watchdogs 64 Stac 57 R44 Stac data compression 3 Standard fax programs 96 Start address 76 Start address pool...

Страница 168: ...4 DHCP R104 Error R97 examples R95 ICMP R103 IP RIP R102 IP Rt R101 IPX watchdogs R100 IPX NetBIOS R101 IPX Rt R98 PPP R97 RIP R99 SAP R99 SCRPT R104 Source R97 SPX watchdogs R101 Time R96 Transmissio...

Страница 169: ...Index ELSA LANCOM Business 159 WWW 37 X X 75 data protection R44 X 75 secured format R44 XModem 22 Y Y connection 57 Y connections R40...

Страница 170: ...Index ELSA LANCOM Business 160...

Страница 171: ...ted by the symbol shown here You can access the menus when configuring via Telnet or terminal programs and via SNMP also see Configuration Modes When configuring with ELSA LANconfig you are provided w...

Страница 172: ...sion table Table firmsafe Mode firmsafe Timeout firmesafe Test firmware Firmware upload Status Connection Current time Operating time WAN statistics LAN statistics PPP statistics IPX statistics TCP IP...

Страница 173: ...was last switched on WAN statistics Displays WAN statistics LAN statistics Displays LAN statistics PPP statistics Point to point protocol statistics IPX statistics Statistics from the IPX and IPX rou...

Страница 174: ...vidual fields of the table have the following significance The following symbols are used for the channel status shown by x in the table The cursor keys have no function in this mode B channel status...

Страница 175: ...crolling through all available messages The model number e g Model 4100 and the firmware version always appear as the final message This display also appears immediately after switching the unit on be...

Страница 176: ...very available interface The table maintained here has the following layout Below is a detailed description of the meaning of each field WAN statistics Running status displays Byte transport statistic...

Страница 177: ...ated channel Rx Number of packets received Tx total Number of packets sent data and protocol packets Tx normal Number of normal data packets sent Tx reliable Number of data packets transferred with se...

Страница 178: ...Average throughput on the channel in the receiving direction Tx s average Average throughput on the channel in the transmission direction LAN statistics Running status displays LAN rx packets Number o...

Страница 179: ...onnection LAN rx bytes Number of bytes received from the LAN LAN tx bytes Number of bytes sent to the LAN LAN rx broadcasts Number of broadcast packets received from the LAN LAN rx multicasts Number o...

Страница 180: ...ed during PPP negotiation are recorded in statistics and displayed by type and quantity If the LCP does not change to the OPEN state for a connection these statistical values provide information on er...

Страница 181: ...minate acknowledge packets received for LCP Rx code reject Number of code reject packets received for PPP Rx protocol reject Number of protocol reject packets received for PPP Rx echo request Number o...

Страница 182: ...Number of PAP failure packets received Tx retry Number of times PAP request packets resent Tx request Number of PAP request packets sent Tx success Number of PAP success packets sent Tx failure Numbe...

Страница 183: ...try Number of times the CHAP challenge packets were resent Tx challenge Number of CHAP challenge packets sent Tx response Number of CHAP response packets sent Tx success Number of CHAP success packets...

Страница 184: ...for IPCP Rx terminate request Number of terminate request packets received for IPCP Rx terminate ack Number of terminate acknowledge packets received for IPCP Rx code reject Number of code reject pack...

Страница 185: ...ted because the remote station will not or can not apply compression Rx reset request Number of CCP queries after synchronizing the compression e g after trans fer errors Rx reset ack Number of confir...

Страница 186: ...d in the sequence of sequence numbers Rx Seq repeat Number of packets in which the sequence of sequence numbers came late Rx Mrru exceeded Number of packets in which a violation of the MRRU negotiated...

Страница 187: ...00000000000 or the MAC address of the router The Tx options show the node ID of the remote station also 000000000000 or the MAC address of the remote station Routing method The routing protocol in use...

Страница 188: ...the WAN IPX WAN rx unicasts Number of directly addressed IPX packets received from the WAN IPX WAN tx Number of IPX packets sent to the WAN Delete values Deletes MAC statistics IPX watchdog LAN rx Nu...

Страница 189: ...d from the WAN by sok ket filter Delete values Deletes IPX propagated packet statistics RIP LAN rx Number of RIP packets received from the LAN RIP LAN errors Number of RIP packets with defective conte...

Страница 190: ...IPXr LAN net errors Number of packets from the LAN to be routed to incorrect networks IPXr LAN backroute errors Number of IPX packets to be backrouted from the LAN IPXr LAN contention Number of packet...

Страница 191: ...00a05702000a 0453 1T 10 45 10 00000081 ffffffffffff 0452 00000001 00a05702000a 0452 Remote ID Network Binding Propagate Backoff Time Node ID Logicalremote station Network address Binding Route Filter...

Страница 192: ...of the responsible router in the WAN network The node ID of the router is entered here for the LAN entry TCP IP stati stics Statistics from the TCP IP area ARP statistics Statistics from the ARP area...

Страница 193: ...e IP WAN rx Number of IP packets received from the WAN IP WAN tx Number of IP packets sent to the WAN IP WAN checksum errors Number of IP packets incorrectly received from the WAN IP WAN service error...

Страница 194: ...P connections from the WAN Delete values Deletes TCP statistics TFTP LAN rx Number of TFTP packets received from the LAN TFTP LAN rx read request Number of TFTP read requests received from the LAN TFT...

Страница 195: ...s Number of TFTP packets repeatedly sent to the WAN TFTP WAN connections Number of TFTP connections established to the WAN Delete values Deletes TFTP statistics DHCP LAN rx Number of DHCP packets rece...

Страница 196: ...te it using an NBNS query P node behavior W Nodes This type of node is not permissible according to RFC but was introduced nevertheless by Microsoft as a hybrid node IP address Node ID Timeout Hostnam...

Страница 197: ...Number of DNS packets sent on the WAN Forwarded Number of requests that could not be fulfilled and were thus forwar ded Errors Number of invalid requests DNS access Indicates the number of names that...

Страница 198: ...mber of LAN packets with an expired time to live value IPr LAN filters Number of LAN packets filtered by the filter table IPr LAN discards Number of LAN packets discarded IPr WAN rx Number of data pac...

Страница 199: ...allows you to display the IP RIP packets received by the device These substatistics provide you with the following entries Table RIP The associated RIP table contains all of the routes learned from th...

Страница 200: ...on connections from the WAN up until the present Outband active connections Current number of active outband configuration connections Outband total connections Total number of previous outband config...

Страница 201: ...kets Number of watchdog packets SPX watchdog queue packets Number of SPX watchdog packets IPX router queue packets Number of IPX router packets Prot heap packets Number of prot heap packets IPr queue...

Страница 202: ...rrent connection has existed If no connection exists No connection is output Charge Indicates the amount of charges for the current connection This value is reset to zero when a new connection is esta...

Страница 203: ...name list Device name Indicates the logical name of the remote station if it can be detected The device name is also displayed on the appropriate display line as soon as a logical connection is estab...

Страница 204: ...n will be deleted from the table instead if necessary Dial Caller The MSN EAZ dialed by the caller Capab The service requested by the caller Possible values are HDLC64K HDLC56K and unknown An analog c...

Страница 205: ...2 statistics Breakdown of the Layer 2 information of the D channel for the B channels Channel B channel identification Protocol D channel protocol Either the protocol fixed in the interface table or t...

Страница 206: ...indicates the logical channel for the router for the LANCAPI e g the IP address of the client that is using the CAPI Charge Number of charging units incurred for this connection Conn time Duration of...

Страница 207: ...Found events Number of calls in which the router found a suitable rule in its tables and successfully rerouted the connection Not found errors Number of calls in which the router did not find a suitab...

Страница 208: ...s transferred to the remote station as a device ID during a verification by PAP or CHAP In addition the device names you assign must be unique For example you might match the device names to the locat...

Страница 209: ...when the remote station is busy Backup delay seconds WAN module WAN settings Ifc Protocol LL B chan Dial prefix S0 Auto 1 0 Ifc Designates the associated interface Protocol D channel protocol setting...

Страница 210: ...be used to control the interface s ability to establish Y connections Possible settings are On Y connection is supported a number of connections can be established simultaneously default A channel bu...

Страница 211: ...f Device name In the Device Name column you can enter an original remote station name which you must then assign to the relevant remote station via the Name option in the Setup menu Dialup remote In t...

Страница 212: ...nt This setting must be used when a callback from the remote stati on is expected Auto not applicable to Windows 9x or Windows NT The connection will be rejected and a direct callback will be initia t...

Страница 213: ...the first DDI For a logical remote station this field can be modified only by means of its first entry in the table The field is automatically updated when other entries are made for this remote stat...

Страница 214: ...n this column you can select the protocol for ISDN layer 2 TRANS The data is packed directly in HDLC packets Always select this setting if communication is to take place via transparent HDLC X 75LAPB...

Страница 215: ...ed as per the Challenge Handshake Authen tication Protocol Key A password may be entered in this column Its presence is indicated by the symbol and it is used to check the remote station It may consis...

Страница 216: ...rom a remote station the remote station call number sent is compared to the entries in the number list If the call number sent is identical to an entry in the list the caller is authorized to establis...

Страница 217: ...station is displayed because a name cannot be entered here Therefore this function must not be used from the keyboard of the ELSA LANCOM If you attempt to establish a connection to a logical remote s...

Страница 218: ...alue from 3 to 5 in order to optimize the callback functionality The default setting is 3 Setup WAN module Backup delay seconds The backup start time indicates the number of seconds to elapse before t...

Страница 219: ...PX module This menu allows you to enter settings for the IPX module particularly for the IPX router The menu has the following layout Operating This option allows you to activate or deactivate the IPX...

Страница 220: ...og packets Filt means that the IPX watchdog packets are neither answered nor transferred locally Users are always logged off after the period of time set in the NetWare server Route causes the watchdo...

Страница 221: ...Loc routing This setting supports the scaling of multiple routers in a local network When all the channels for one router are already seized and packets for other remote stations are still being rece...

Страница 222: ...ing entries The columns have the following meanings Remote ID Name of the logical remote station as specified in Setup WAN module Name list Network Address of the network on the WAN side A standalone...

Страница 223: ...is performed for both single IPX packets and propagated IPX packets Setup IPX module RIP configuration This option allows you to store settings for RIP data packets router information The menu has th...

Страница 224: ...the following appearance Routes FRM This parameter sets the maximum number of routes that can be included in a RIP frame The specified value originally defined by Novell is 50 Today however it is comm...

Страница 225: ...l for a spoofing time control in which RIP data can be transferred to the remote side is given here You can enter a value from 1 to 60 minutes the default value is 5 Setup IPX module SAP configuration...

Страница 226: ...nd description of SAP services please refer to the section entitled Novell SAP Numbers WAN filter table As with the LAN filter table you can use the WAN filter table to prevent ranges of service infor...

Страница 227: ...e min The periodic transfer interval for a spoofing time control in which SAP data can be transferred to the remote side is given here You can enter a value from 1 to 60 minutes the default value is 5...

Страница 228: ...r of the individual network With such an access an IP address is not assigned to the router by a PPP negotiation but it must have a fixed IP address registered in the Internet Intranet address A secon...

Страница 229: ...n interface based on the TFT protocol SNMP the configuration interface based on the SNMP Each of the maximum of 16 entries in the access list has the following structure Once an IP workstation with it...

Страница 230: ...s Table ARP This option allows you to display the ARP table ARP cache which is managed automatically for the purpose of mapping IP addresses onto physical terminal addresses Individual entries can be...

Страница 231: ...ress by the remote station In this procedure the router queries the IP address 0 0 0 0 at the remote station and is assigned a random IP address by the remote station which is then used for further pr...

Страница 232: ...ed The IP routing table below is provided by way of example and also shows the default settings However if these addresses are required for Intranet use for example it is possible to delete the predef...

Страница 233: ...you can determine how the packets are to be filtered If packets with the entered ports are received from the LAN side they will not be forwarded always filter unless a connection is currently in place...

Страница 234: ...Always filt Connect filt and Internet filt Always filter The packet is discarded Connect filter The packet is discarded if there is no connection to the remote station Internet filter The packet is di...

Страница 235: ...via the local network The local routing is necessary if the router as the default gateway for the workstations receives packets for destination networks to which it cannot establish a connection itse...

Страница 236: ...ernet protocol If you select Reliable all ICMP packets received are placed in the reliable queue Setup IP router module RIP configuration This option allows you to enter settings for the management of...

Страница 237: ...P network mask 255 128 0 0 Table IP RIP This option allows you to display the entries in the current dynamic IP routing table An IP RIP routing table might for example have the following appearance Se...

Страница 238: ...server that can be reached via a router with the IP address 192 38 50 100 Table masquerading With IP masquerading the IP addresses of computers in the local network are rendered invisible to external...

Страница 239: ...r IP address port mac address timeout is used to direct the router to enter the given address in the monitor table and to send traps to it If the traps are not received within the set hold time the ad...

Страница 240: ...ad the device will determine the appropriate addresses start or end from the settings under Setup TCP module The procedure is as follows If only the IP address or only the Intranet address is entered...

Страница 241: ...broadcast address entered in the DHCP module or uses the broadcast address that belongs to the local network determined during address assignment Max lease time minute s Here you can enter the maximum...

Страница 242: ...ank NT Domain A workgroup domain can be specified in the NT domain item to trigger the search procedure when starting the NetBIOS module This is required if the network does not contain any computers...

Страница 243: ...0 5000 xx00 WORKGROUP 1e 10 0 1 100 GLASGOW 5000 xx20 Name Name of the host in the host table Group Domain Name of the group or domain in the group list Groups and NT domains are han dled in the same...

Страница 244: ...rkgroup or domain in which the server is located UPD Update counter indicates the number of times that the server has already propa gated itself IP address Address of the server OS Ver Operating syste...

Страница 245: ...no longer entering data the device automatically releases the connection at the end of the time period specified here Possible settings are from 1 to 99 minutes the default setting is 5 minutes Login...

Страница 246: ...y connections of a router connection with channel bundling the selection 3 also breaks main channels of a router connection LANCAPI module LANCAPI settings Access list List of computers allowed to use...

Страница 247: ...will be made via the normal telephone company LCR module Least cost router settings Router usage Activate LCR for the router modules On or Off Lancapi usage Activate LCR for the LANCAPI On or Off Tim...

Страница 248: ...00 3 03100000 4 25120000 5 26120000 6 02041999 7 13051999 Index Continuing index of entries in the table Date Dates of holidays Enter the index and the date in full without separators e g set 8 130419...

Страница 249: ...hile can stand for a random number of characters Multiple instances of the wildcard can be used For example xxx filters all names containing the letters xxx in any position within the name The IP addr...

Страница 250: ...e module Time module settings Operating Activating the module On Off Current time Displays the current time in the device Time call number Call number to which a connection must be established to rece...

Страница 251: ...an error occurs during the upload the device automatically reactivates the previous firmware version and reboots the device login To prevent problems caused by defective firmware the second option wi...

Страница 252: ...e the system asks you to enter the configuration protection password in order to ensure that you have not mistakenly selected this command instead of the Boot system command If no password has been as...

Страница 253: ...B4 69 0045 DI3270 Gateway 71 0047 Advertising Print Server 74 004a NetBlazer Modems 75 004b Btrieve VAP NLM 5 0 76 004c Netware SQL VAP NLM Ser ver 77 004d Xtree Network Version Net ware XTree 80 0050...

Страница 254: ...erver or XTree Tools 394 018A NASI services broadcast ser ver Novell 432 01b0 GARP Gateway net research Deci mal Hexa decimal SAP description 433 01b1 Binfview Lan Support Group 447 01bf Intel LanDesk...

Страница 255: ...Running on a Novell Server 1038 040E LVLIC Running on a Novell Server 1044 0414 Kyocera Deci mal Hexa decimal SAP description 1065 0429 Site Lock Virus Brightworks 1074 0432 UFHELP R 1075 0433 Synopti...

Страница 256: ...55 Site Lock User 25362 6312 Tapeware 28416 6f00 Rabbit Gateway 3270 30467 7703 MODEM 32770 8002 NetPort Printers Intel or LANport 32776 8008 WordPerfect Network Version 34238 85BE Cisco Enhanced Inte...

Страница 257: ...53 tcp nameserver 53 udp mtp 57 tcp bootp 67 udp tftp 69 udp rje 77 tcp finger 79 tcp www 80 tcp www 80 udp link 87 tcp supdup 95 tcp hostnames 101 tcp iso tsap 102 tcp dictionary 103 tcp x400 103 tc...

Страница 258: ...703 udp acctprinter 704 udp elcsd 704 udp acctinfo 705 udp acctslave2 706 udp Capab Port no Protocol acctdisk 707 udp kerberos 750 tcp kerberos 750 udp kerberos_master 751 tcp kerberos_master 751 udp...

Страница 259: ...TCP IP ports ELSA LANCOM Business R89 rscsb 10011 udp qmaster 10012 tcp qmaster 10012 udp Capab Port no Protocol...

Страница 260: ...TCP IP ports ELSA LANCOM Business R90...

Страница 261: ...f the ELSA LANCOM is forwarded as the user name Once the script is complete a PPP negotiation is started or the login procedure is concluded The layer 3 entry in the layer list is used to define wheth...

Страница 262: ...list Name list Device name Script CSERVE Host CIS User U Password P PPP C Device name Name of the logical remote station Script All commands to be executed a maximum of 58 characters per line is avail...

Страница 263: ...is displayed Device name Authent Key Time Rep User name CSERVE none 0 0 xxxxxx xxxx PPP CISPPP Device name Script CSERVE Host CIS User U Password P PPP C Element Meaning Start script on the remote sta...

Страница 264: ...displays are activated for a protocol the next output will overwrite the current system prompt every additional output will be preceded by a Return LineFeed If the user presses a key the entire buffe...

Страница 265: ...cols and functions The following symbolic names for protocol stacks are supported Input Effect trace Output of all protocols that can be generated in the trace out puts configuration session and the s...

Страница 266: ...ing form as a prefix Format days d _ hours Minutes Seconds _ Example 12t 07 23 15 corresponds to the system time of twelve days seven hours twenty three minutes and fifteen seconds NetBIOS Display IPX...

Страница 267: ...s that have occurred on a WAN interface They are displayed in the following format Format Interface Error Example Ch01 No response The remote station dialed did not react to the call Online trace PPP...

Страница 268: ...xample Ch01 Rx IPXCP ConfReq ID 00 Length 22 In the above example a configure request for the IPX control protocol with the ID 00 and a length of 22 bytes has been received on the first B channel If a...

Страница 269: ...network 00000002 is received from the local network The RIP request was sent from the IPX node 0000c0123456 Example LAN Rx node 00a057123456 Resp Route 00000002 Hops 0001 Tics 0002 Up An RIP response...

Страница 270: ...can therefore only have occurred because of the WAN s evaluation of a SAP response LAN age The SAP process of the router ages all server services forwarded from the local network minute by minute Afte...

Страница 271: ...the IPX watchdog packets Online trace IPX NetBIOS The outputs under NetBIOS describe the processing of IPX NetBIOS and IPX propagated packets The trace outputs are displayed in the following format Fo...

Страница 272: ...he processing of IP routing information protocol frames by the RIP process of the IP router The trace outputs are displayed in the following format Format Source interface Receive transmit Action Sour...

Страница 273: ...utputs are displayed in the following format Format Source interface Receive Transmit Action Source address Target address Target Action Example LAN Rx request SrcIP 194 162 38 162 DstIP 194 162 38 17...

Страница 274: ...7 TCP reset Online trace SCRPT The outputs under SCRPT describe the progress of a script negotiation The display is in the following format Format Source interface Receive transmit Error Text Action E...

Страница 275: ...requires secured transmission of the associated IP packet Packets identified as such are always transmitted over a secured queue corresponding to their reception sequence In an extreme case this can...

Страница 276: ...e All other packets are placed in the normal send queue This means simultaneously that any normal IP packets from secured or urgent packets can be removed with maximum filling of the send queue of thi...

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