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RIDGING

AND

OUTING

Introduction

A -1

Bridging and Routing Concepts

A -1

Guidelines for Choosing Bridging or Routing

A -2

How Bridges Learn

A -2

Bridging Between Remote Sites

A -3

Building a Larger Network

A -4

Multiple Paths Between Bridge LANs

A -5

Network Topology

A -6

Broadcast Storms

A -6

Optimum Use of Resource

A -6

Network Organization, Structure, and Physical Layout

A -6

The Internet

A -7

Routing IP

A -7

Open Systems Interconnection Network Layer Model

A -8

IP Routing

A -9

IP A

DDRESSING

Introduction to IP Addressing

B - 1

IP Addressing Basics

B - 1

Address Classes

B - 1

Subnetting

B - 1

Reserved Addresses

B - 2

Supernetting (Advanced TCP/IP)

B - 3

Supernetting and the OfficeConnect Remote 840

B - 4

IP Subnet Mask Address

B - 5

IP Planning

B - 5

Assigning IP Addresses and Subnetting

B - 5

Single IP Address

B - 6

Range of IP Addresses

B - 6

IP Numbered and Unnumbered Links

B - 7

840ug.book Page 11 Friday, July 7, 2000 2:23 PM

Содержание OfficeConnect 3C840

Страница 1: ...http www 3com com OfficeConnect Remote 840 SDSL Router User s Guide Release 1 2 0 Part No 10031396 Rev AA May 2000 840ug book Page 1 Friday July 7 2000 2 23 PM...

Страница 2: ...3Com s standard commercial license for the Software Technical data is provided with limited rights only as provided in DFAR 252 227 7015 Nov 1995 or FAR 52 227 14 June 1987 whichever is applicable You...

Страница 3: ...at is a BRouter 1 4 Routing vs Bridging 1 4 MAC Encapsulated Routing 1 4 What is a Remote Site 1 5 What is RFC 1483 1 6 Benefits of Using RFC 1483 1 7 What is RFC 1490 1 7 What is PPP 1 7 Benefits of...

Страница 4: ...rming System Administration Tasks 2 1 Controlling Login and Telnet Access 2 1 Adding a Login 2 2 Deleting a Login 2 2 Modifying the Date and Time 2 3 Restoring Factory Defaults 2 3 Using the OfficeCon...

Страница 5: ...ting an IP Network 4 4 Configuring IP RIP on the LAN 4 5 Local Site LAN RIP 4 5 Advanced RIP Modification Options 4 5 Resetting Parameters 4 6 Configuring IP for the Remote Site Connection 4 7 Configu...

Страница 6: ...nections 5 4 Enabling Bridging 5 5 Bridging IP Traffic 5 5 MAC Encapsulated Routing 5 6 Bridge Firewall 5 7 Advanced Bridging Options 5 9 Default Bridge Mode 5 10 Default Bridge Mode Overview 5 10 Ins...

Страница 7: ...Configuring the DHCP Relay 7 4 Monitoring DHCP 7 4 DHCP Smart Mode Overview 7 4 8 CONFIGURING DNS Introduction 8 1 DNS Overview 8 1 Configuring DNS 8 2 Configuring Remote DNS Servers 8 2 Configuring S...

Страница 8: ...RIP and SAP 9 11 IPX Routing Configuration to Support MAC Encapsulated Routing 9 12 Monitoring IPX 9 12 IPX Testing 9 12 10 UPGRADING OPERATIONAL SOFTWARE FOR THE OFFICECONNECT REMOTE 840 Introductio...

Страница 9: ...IP TCP UDP ICMP Counters and Tables 11 10 DHCP 11 10 DHCP Lease Table 11 10 DHCP Counters 11 11 Address Translation 11 11 Table of Mapped Addresses 11 11 Table of Port Assignments 11 12 IPX 11 13 IPX...

Страница 10: ...nnect Remote 840 Manager 12 12 Modifying an Existing Filter Using the OfficeConnect Remote 840 Manager 12 13 Turning a Filter Off Using the OfficeConnect Remote 840 Manager 12 13 13 TROUBLESHOOTING In...

Страница 11: ...Physical Layout A 6 The Internet A 7 Routing IP A 7 Open Systems Interconnection Network Layer Model A 8 IP Routing A 9 B IP ADDRESSING Introduction to IP Addressing B 1 IP Addressing Basics B 1 Addre...

Страница 12: ...ctions for Internet Access E 1 Step 1 Configuring Remote Site General Information E 1 Step 2 Configuring the Remote Site ATM Parameters ATM Only E 4 Step 3 Configuring the Remote Site IP Network Infor...

Страница 13: ...e Configuration E 14 F TECHNICAL SUPPORT Online Technical Services F 1 World Wide Web Site F 1 Support from Your Network Supplier F 1 Support from 3Com F 2 Returning Products for Repair F 2 3COM CORPO...

Страница 14: ...840ug book Page 14 Friday July 7 2000 2 23 PM...

Страница 15: ...e box when your purchased your Router That guide contains steps to get the user started accessing the Internet or telecommuting to a remote office This OfficeConnectRemote 840 SDSL Router User s Guide...

Страница 16: ...9 Upgrading Software Chapter 10 Monitoring Capabilities Chapter 11 Configuring Filters Chapter 12 Troubleshooting Chapter 13 Information on the difference between Bridging and RoutingAppendix A Infor...

Страница 17: ...r in angle brackets Example To add a login user use the following syntax Add user name password password In this example you must supply a user name for name and a password for password Commands The w...

Страница 18: ...ectrical power by fitting an in line surge suppressor or uninterruptible power supply Products manufactured by 3Com are safe and without risk provided they are installed used and maintained in good wo...

Страница 19: ...rea that is free from dust or extreme temperatures The unit has been designed to be a free standing unit Do not place anything else on top of the unit s case Allow a clearance gap of at least a 150 mm...

Страница 20: ...6 ABOUT THIS GUIDE 840ug book Page 6 Friday July 7 2000 2 23 PM...

Страница 21: ...a Remote Site What is RFC 1483 What is RFC 1490 What is PPP What is DHCP What is DNS What is Address Translation What is DHCP Smart Mode What Is Default Bridge Mode Getting Started Quickly OfficeConn...

Страница 22: ...e networked workstations to connect to other computers on a remote LAN Once connected local users a local branch office can communicate with remote computers the main office as if they were connected...

Страница 23: ...ion to connect to a remote site using a network protocol such as IP or IPX The OfficeConnect Remote 840 contains one SDSL modem port which is the WAN interface What is ATM Asynchronous Transfer Mode A...

Страница 24: ...re for the most part maintained automatically by the unit so the administrator does not have to add or delete entries as the network topology changes An example illustrating the difference between bri...

Страница 25: ...work Data is transmitted to and from remote sites through ATM or Frame Relay With ATM each VC has a configured Quality of Service QOS and is identified by a Virtual Path Identifier VPI and a Virtual C...

Страница 26: ...esses When PPP is used both the local and remote WAN addresses can by dynamically learned Otherwise they must be specified The diagram below shows an OfficeConnect Remote 840 with 3 VCs and the corres...

Страница 27: ...col It is a single or multi link interface between two packet switching devices such as a bridge or router A PPP link may be created between the OfficeConnect Remote 840 and a remote router after they...

Страница 28: ...red mode ocrdsl 3com com is not configured by default In this mode you will have to configure a static host entry What is Address Translation Address Translation allows private network addresses to be...

Страница 29: ...etting Started Quickly The features described above can be utilized to make configuring the OfficeConnect Remote 840 very easy Use DHCP Smart Mode to preconfigure a LAN IP address the DHCP pool of add...

Страница 30: ...Chapter 3 of the OfficeConnect Remote 840 SDSL Router Installation Guide in the section Installing The OfficeConnect Remote 840 LED Status Meaning Alert FLASHING RED When software is initializing Powe...

Страница 31: ...e transmit Tx and receive Rx signal pairs on Ethernet port 1 When MDI X is out not depressed Port 1 is pinned the same as the remaining 3 ports In this mode a PC s Ethernet port or the cascade port on...

Страница 32: ...DLCI settings see the table above If you set the OfficeConnect Remote 840 to this mode and no configuration exists the OfficeConnect Remote 840 will automatically set up a bridge network on the Ethern...

Страница 33: ...ote 840 to route or bridge a network 1 Complete the appropriate Configuration Planning Form A form is provided in the box when you purchase your OfficeConnect Remote 840 Copies of the forms are provid...

Страница 34: ...correctly you will need to use at least Netscape Navigator 4 0 or Internet Explorer 3 02 Internet Explorer 4 is provided on the OfficeConnect Remote 840 Installation CD You do not need to be connected...

Страница 35: ...ave an IP address of 192 168 200 254 and a DNS host name of ocrdsl 3com com When prompted to login to the unit enter the administrative login name and password After successful authentication you will...

Страница 36: ...a to quickly get back to the top of the menu hierarchy or to one of the five menu options selections You can configure your web browser s link display options to customize the colors of the Quick Link...

Страница 37: ...kstation where you will run your OfficeConnect Remote 840 Manager browser That is if you have two workstations from which you will run the OfficeConnect Remote 840 Manager and if you want access to th...

Страница 38: ...1 18 CHAPTER 1 OVERVIEW 840ug book Page 18 Friday July 7 2000 2 23 PM...

Страница 39: ...Access This allows you to set up management access security The configured username and password combination allows web browser and Telnet access Connecting to the OfficeConnect Remote 840 with a web...

Страница 40: ...the login or Telnet username in this field Password Enter the login or Telnet password in the field 3 After the fields have been entered click Submit To clear the fields click Reset Deleting a Login 1...

Страница 41: ...ator System screen If you boot to the unconfigured state you will need to run IP Wizard or use CLI to reassign an IP address to your OfficeConnect Remote 840 If you boot in DHCP Smart Mode the IP addr...

Страница 42: ...modes later using CLI or the OfficeConnect Remote 840 Manager 3 While holding down the Reset button on the back panel plug the unit back in You should hold down the reset button for at least five seco...

Страница 43: ...t ocr840 index html and click the drop down menu under software MIB downloads To set up an SNMP community on the OfficeConnect Remote 840 follow these instructions 1 From the home page select Configur...

Страница 44: ...s The Trivial File Transfer Protocol TFTP provides a simple way to transfer files from one machine to another The OfficeConnect Remote 840 has a TFTP server that allows you to copy files to or from th...

Страница 45: ...tions 1 From the home page select Configuration Global Administrator TRAP Click Add and the following screen fields appear 2 Enter the following fields Name Enter the name of the SNMP Trap Manager Add...

Страница 46: ...syslog manager as follows 1 From the home page select Configuration Global Administrator Syslog Click Add and the following screen fields appear 2 Enter the following fields Syslog Host IP Address En...

Страница 47: ...ctions Remote Site Overview To set up connections over the WAN a remote site profile must be created and edited for each remote location you want to connect to With this profile you specify ATM virtua...

Страница 48: ...ficeConnect Remote 840 Manager automatically disables and re enables the remote site profile when the Modify button is pressed on the Remote Site menu page To disable or enable a profile manually clea...

Страница 49: ...Remote Site General Modify screen 3 Change configuration parameters as needed and use the Next button to continue to the ATM IP IP Advanced and IPX configuration screens For quick help on specific par...

Страница 50: ...e established For PPP the authentication name and password must be provided to allow the connection to be established The OfficeConnect Remote 840 supports both PAP and CHAP authentication The Network...

Страница 51: ...using Frame Relay the Remote Sites General Modify screen will contain the following fields 2 Enter a name to identify the remote site 3 Select Network Service to either PPP over Frame Relay or RFC 149...

Страница 52: ...o log in to the same remote site with different PPP authentication parameters You should disable all profiles using the same VPI VCI and then enable the one that should be active For SVCs there is not...

Страница 53: ...o limit has been specified for the rate for information flow VBR Variable Bit Rate a certain rate has been specified for the flow of information CBR Constant Bit Rate a constant rate has been specifie...

Страница 54: ...ing IPX Routing Configuring Bridging Network Address Translation Using the OfficeConnect Remote 840 Monitoring Remote Site Connections To determine which remote sites have been configured and to see a...

Страница 55: ...Remote 840 can be configured as a router to forward packets between the local LAN interface and one or more Remote Sites The router maintains a forwarding table This table specifies which interface t...

Страница 56: ...rding box to enable the routing of IP packets In addition to Forwarding the RIP check box is used to enable or disable RIP for all Remote Sites and the local LAN If RIP is globally disabled it is disa...

Страница 57: ...Site LAN IP Click Add This brings up a screen containing the following fields Enter the following information Name The name is limited to 32 characters If you use any blank spaces surround the whole...

Страница 58: ...he IP Modify Delete screen containing the following fields 4 Modify or delete the information about the selected IP network by altering the fields and clicking the Modify Delete button If you alter th...

Страница 59: ...local site connection from the list and click Modify Delete which accesses the IP Modify Delete screen containing the following fields You can then select the RIP version to be either None RIPV1 or R...

Страница 60: ...nnot exceed for this function 2 Under the following two categories you may customize your RIP Advanced RIP Policies You may enable these options as necessary They control what is sent out or received...

Страница 61: ...static routes RIP usage IPX IPX network address information static routes and services RIP usage Bridging Enable or disable bridging to the remote site If you need to connect to multiple remote sites...

Страница 62: ...ress If you were provided a single IP address select Specified and enter that address If you are using PPP to dynamically assign an address select Dynamic and the remote site on the WAN will assign a...

Страница 63: ...enu to have the RIP set to Broadcast Listen or Broadcast Listen and if one of these is chosen set the RIP option to RIPV1 or RIPV2 If you are using address translation PAT NAT you must set routing to...

Страница 64: ...or None Broadcast refers to when routing information packets are sent out to the network and Listen refers to the OfficeConnect Remote 840 receiving routing information packets from remote sources If...

Страница 65: ...rks not learned using RIP Adding a Static IP Route to the LAN To add modify or delete an IP Static route to the LAN follow these steps 1 Select Configuration Global IP Static Routes 2 Click the Add bu...

Страница 66: ...Delete button to erase the parameters you have set Using IP Address Validation When IP Source Validation is enabled the source address of all IP frames received from a remote site will be validated A...

Страница 67: ...ting combines routing and bridging so that routing features i e Address Translation DNS Proxy DHCP Server etc are available in a bridged environment There are no specific changes required in the IP ro...

Страница 68: ...cal LAN with name ip and the Remote Site Internet have active IP interfaces IP Testing PING You can now run a PING to make sure the OfficeConnect Remote 840 can reach the remote router You can run the...

Страница 69: ...the IP address belongs or to a default gateway If it was sent to the specific network and the network was learned via RIP there is probably a temporary network problem If the network is a static entry...

Страница 70: ...S prompt and type ping remote IP address Enter where the remote IP address is the address of a host on the remote network Ex ping 10 0 0 12 If no address was provided contact the ISP or the remote sit...

Страница 71: ...Internet Access Only If you are connecting to the Internet start a web browser and enter an address such as http www 3com com If the 3com web site home page comes up all is configured correctly and y...

Страница 72: ...4 18 CHAPTER 4 CONFIGURING IP ROUTING 840ug book Page 18 Friday July 7 2000 2 23 PM...

Страница 73: ...Bridging Testing Bridging Overview A bridge connects two or more LANs together at Layer 2 data link of the ISO OSI 7 layer model A learning bridge links networks but also separates network traffic an...

Страница 74: ...flexible configuration of simultaneous bridging and routing For more information on the Bridge Firewall see Appendix A Bridging and Routing A boot mode Default Bridge Mode can be activated This autom...

Страница 75: ...uration screen to define or modify a bridged network over the LAN Only one bridged network can be added over the LAN Adding a Bridge Network You may add a bridged network over the Ethernet interface b...

Страница 76: ...click Delete 6 Click Modify after you have entered the field Configuring Bridging for the Remote Site Connections To set up a protocol over the WAN a remote site profile must be created and edited fo...

Страница 77: ...onfigure To enable bridging 1 From the OfficeConnect Remote 840 home page select Configuration Remote Sites WAN select a remote site definition and click Modify This accesses the Remote Sites General...

Страница 78: ...ase their forwarding decision on network level addresses packets that are routed over a WAN are transmitted without MAC layer addresses Additionally address resolution procedures that can be used to d...

Страница 79: ...ote 840 home page and select Configuration Remote Sites WAN 2 Select a defined remote site and click Modify This will access the Remote Sites General Modify screen containing the following fields 3 Ch...

Страница 80: ...AC address of the OfficeConnect Remote 840 it is discarded Additionally broadcasts including ARPs for the protocol are not passed to the bridge 2 Forward Unicast Packets Only Unicast If a protocol is...

Страница 81: ...o bridging over the WAN as well as the LAN Most users do not need to change these values from the defaults To alter advanced bridging configurations 1 Go to the OfficeConnect Remote 840 home page and...

Страница 82: ...ttings control the WAN operational mode ATM or Frame Relay and the VPI VCI or DLCI settings If you set the OfficeConnect Remote 840 to this mode and no configuration exists the OfficeConnect Remote 84...

Страница 83: ...Monitoring Bridging Viewing Bridge Network Status You can view bridge network status from the Monitor Networks Network Status screen This lists the networks WAN networks incorporate the word port in...

Страница 84: ...problems with bridging IP check that IP Forwarding is disabled on the Configuration Global IP IP Settings screen Also be sure that your LAN IP Addresses belong to the same IP network as the remote sit...

Страница 85: ...ntries Configuring NAT Monitoring Selecting Address Translation You must have a Remote Site Profile already defined to set up address translation for this remote site 1 From the OfficeConnect Remote 8...

Страница 86: ...r Static TCP or Static UDP to select the Port Table type to be managed If you selected NAT click either Dynamic or Static for the IP Address Table to be managed Configuring the PAT Default Address Whe...

Страница 87: ...e an entry containing public TCP port 80 the IP address of a web server on your LAN and the private TCP port 80 allows controlled access to the web server but not the rest of your LAN For a list of as...

Страница 88: ...onsist of a start IP address number of addresses in the pool and a mask to be used for Routing Information Protocol RIP messages if the public addresses are to be advertised Multiple pools can be assi...

Страница 89: ...and the value of the inactivity timer For both NAT and PAT the active address mappings are shown in the Monitor Networks NAT PAT Mapped Addresses screen Only those mapping for the specified Remote Si...

Страница 90: ...6 6 CHAPTER 6 NETWORK ADDRESS TRANSLATION USING THE OFFICECONNECT REMOTE 840 840ug book Page 6 Friday July 7 2000 2 23 PM...

Страница 91: ...ent of IP addresses it broadcasts a request out on the LAN The DHCP Server responds with An IP address for the workstation The domain name The IP addresses of the default router two DNS Servers and tw...

Страница 92: ...onnect Remote 840 has three DHCP modes Server Relay and Disable To configure the mode select Configuration Global DHCP from the home page The following screen will be shown To configure the OfficeConn...

Страница 93: ...he workstation A numeric suffix is appended to the base name and incremented after each assignment For example if the Hostname unit is configured the first workstation will be assigned the Hostname un...

Страница 94: ...monitoring capability allows you to display DHCP protocol counters and current lease information To display the DHCP protocol counters access the Monitor Networks DHCP DHCP counters screen To display...

Страница 95: ...192 168 200 254 If you choose DHCP Smart Mode you should set up the workstations on the OfficeConnect Remote 840 s LAN to automatically obtain their IP address This is the default setting in Windows...

Страница 96: ...7 6 CHAPTER 7 CONFIGURING DHCP 840ug book Page 6 Friday July 7 2000 2 23 PM...

Страница 97: ...o configure remote DNS Servers for specific domains For instance assume you have two remote sites configured one to the Internet and the other to a corporate site which has a domain name of 3com com T...

Страница 98: ...field 3 To specify the amount of time to wait for a timeout when the OfficeConnect Remote 840 attempts to reach a primary or secondary DNS server enter the number of seconds in the Timeout field 4 Cl...

Страница 99: ...the DNS Server List button from the DNS page 2 To add a new entry click Add The following screen appears 3 Enter the domain name for the entry enter for the default If the remote site uses PPP the DNS...

Страница 100: ...Remote 840 can function as a DNS server 1 If you want to configure any Static DNS Entries select Static DNS Entries and click Add 2 Then enter the Domain Name and the Host IP Address of the machine t...

Страница 101: ...to route an IPX packet based on the destination IPX network number Entries into the forwarding table are either static or dynamic Static entries are based on the LAN s network number the remote site W...

Страница 102: ...reen to define or modify all IPX networks over the LAN Note that each IPX network defined over the LAN must support a different frame type Adding a Local IPX Network To add a Local IPX network 1 From...

Страница 103: ...fields If you need to return to the original parameters for this screen click the Reset button before you click Modify Configuring IPX for Remote Sites Connection To set up a protocol over the WAN a r...

Страница 104: ...tions assume you have already added a remote site profile If you need to add a remote site profile see Remote Site Management in Chapter 3 for details on adding a remote site profile Configure the Rem...

Страница 105: ...r from dynamic routes in that dynamic routes are learned from real time via RIP or when new connections are established A framed route is much like a static route in that you manually configure the ro...

Страница 106: ...is for a data packet in seconds 4 Click Submit To clear the fields click Reset 5 To delete a route from your configuration select the route and click Delete Adding a Framed IPX Route to a Remote Site...

Страница 107: ...ains IPX server names the services they provide their network and node addresses and their relative distances Examples of services include file servers and printers A static service entry will remain...

Страница 108: ...r Server Node Address The node address of the remote server Gateway Network Address The network node address of the gateway Socket The socket number on the server Metric The number of routers 1 15 thr...

Страница 109: ...Services 5 Click Add to define the following parameters Server Name The name of the remote server Server Network Address The network address of the remote server Server Node Address The node address...

Страница 110: ...ontaining the following parameters Your network performance may be degraded if you set the IPX maximum packet size to less than 500 bytes It is not generally recommended to modify the IPX maximum pack...

Страница 111: ...ontinue clicking Next to advance through the ATM Modify IP Modify and IP Advanced Modify screens 3 Click Next to proceed to the IPX Modify screen 4 Using the IPX Routing box select the mode for RIP an...

Страница 112: ...Monitor Networks IPX IPX Counters screen indicates the number of data packets received and forwarded or discarded To display the IPX interfaces Go to the Monitor Networks Network Status screen When a...

Страница 113: ...IPX Testing 9 13 For more information on these monitoring screens see Monitoring the OfficeConnect Remote 840 in Chapter 11 840ug book Page 13 Friday July 7 2000 2 23 PM...

Страница 114: ...9 14 CHAPTER 9 CONFIGURING IPX ROUTING 840ug book Page 14 Friday July 7 2000 2 23 PM...

Страница 115: ...The method of obtaining the latest versions of the OfficeConnect Remote 840 Operational Software is either via the 3Com website www 3com com ocr840 or via the CD Install the latest version software f...

Страница 116: ...ational Software to the OfficeConnect Remote 840 Unit After you have obtained the operational software using one of the described methods it will reside on your computer s hard drive in a file with an...

Страница 117: ...be guided through the update process When browsing for the update file select All files on the file type pull down menu Installing Software via DOS Your OfficeConnect Remote 840 Installation CD instal...

Страница 118: ...includes REM the REM version number of the NAC file The version number of REM the NAC file is part of the filename The filename syntax is REM REM vaxxyyzz where xx major version number REM yy minor v...

Страница 119: ...work service Critical Events Log Overview The OfficeConnect Remote 840 Manager provides a wide range of monitor screens including real time throughput graphs routing tables and interface and protocol...

Страница 120: ...SDSL link comes up This maximum can be calculated from the negotiated SDSL baud and constellation rates see ATM Interface section below Because the SDSL link is shared by all remote site connections...

Страница 121: ...thernet interface information is displayed in the row containing the interface name eth 1 The Oper Status column indicates whether the interface link is operationally up or down If it is down there ma...

Страница 122: ...by selecting Monitor Ethernet The counters displayed include the number of bytes transmitted bytes received and errors Error counters may not increment consistently For example rebooting the device ma...

Страница 123: ...umn indicates whether the interface link is operationally up or down If it is down there may be a cabling problem The Admin Status is set to up by default If this field says down then the interface ha...

Страница 124: ...should be reported to your service provider SDSL Transceiver Status The transceiver status screen provides line information that can be useful to the service provider when you experience line problem...

Страница 125: ...e Site Counters Then select the remote site name from the list and press the Show button The counters include the number of packets and bytes transmitted and received and error counters The error coun...

Страница 126: ...e created when you configure IP over the LAN and when a remote site connection is configured to route IP traffic To view the list of IP networks and their status bring up the Network Status screen Thi...

Страница 127: ...came up have the protocol type of LOCAL STATIC routes are those that have been configured statically The protocol type of RIP indicates routes that were learned from IP RIP information exchange with...

Страница 128: ...Remote 840 Manager home page and select Monitor Networks IP Select the desired counters from the screen shown below DHCP DHCP Lease Table Workstations on the LAN lease IP addresses from the OfficeCon...

Страница 129: ...s Translation Table of Mapped Addresses You can view the dynamic Network Address Translation NAT and Port Address Translation PAT mapped address table To access this table from the OfficeConnect Remot...

Страница 130: ...onnect Remote 840 Manager home page select Monitor Networks NAT PAT Select the remote site profile whose address translations you want to look at and then select Port Assignments This table is created...

Страница 131: ...ol the interface over which the network runs eth 1 for LAN atm 1 or hdlc 1 for WAN how the network was created static for LAN dynamic for WAN and the network address assigned to the connection IP and...

Страница 132: ...ks are created when you configure bridging over the LAN and when a remote site connection is established that is configured to bridge traffic To view the list of bridge networks and their status bring...

Страница 133: ...s the learned MAC addresses and counters for data traffic that has been received forwarded or not forwarded filtered and transmitted Bridge Counters Bridge counters provide transmit and receive counts...

Страница 134: ...vents Connection Events The following screen capture shows a successful connection to a remote site named red using PPP network service Critical Events Log Critical Events Log The Critical Event Log c...

Страница 135: ...nnect Remote 840 Manager Step by Step Guide to Creating Filters Using the OfficeConnect Remote 840 Manager Filtering Overview Filters can provide added security by accepting packets only from specific...

Страница 136: ...e access to the local network or vice versa Filter Classes The OfficeConnect Remote 840 supports three filter classes Input data filter packets as they enter Output data filter packets as they exit Em...

Страница 137: ...low filtering based on the source network destination network protocol type source socket destination socket source node and node designation of the IPX packet Bridge Controls network access based on...

Страница 138: ...Using the OfficeConnect Remote 840 Manager The OfficeConnect Remote 840 Manager supports data filters only not advertisement filters Data filters are used to remove packets from the normal flow of dat...

Страница 139: ...nected to a remote corporate office using an OfficeConnect Remote 840 Two of the LAN workstations are used by contractors who are not given access to the corporate office To prevent traffic from the t...

Страница 140: ...40 Manager Filter Screens The OfficeConnect Remote 840 Manager HTML filter screens provide an easy to use menu system for specifying the direction location of the traffic to be checked and for creatin...

Страница 141: ...s you to select on which direction location you are going to setup or change a filter Pressing the Next button brings up the Filter Summary page Filter Summary Shows you a summary of previously define...

Страница 142: ...on to the previous condition For condition number 1 the user is prompted to select the action of the filter Discard Packet or Forward Packet Also common is the Next button which takes you to the Condi...

Страница 143: ...Equal to is Not Equal to is Greater Than is Greater Than or Equal to is Less Than is Less Than or Equal to ____ 1 65536 Generic Byte Filter Origin IP Header IP Data Offset ____ 0 1514 bytes Length __...

Страница 144: ...ignored The Add button returns you to the appropriate filter condition screen so you can define the next condition The Delete button returns you to this screen unless you have just deleted the last c...

Страница 145: ...aning as discard any TCP packet whose destination address is 30 0 0 1 and discard all UDP packets Delete Filter Add Condition You get to this screen after deleting the last condition in a filter You h...

Страница 146: ...the Filter Summary screen for this direction location 2 On the Filter Summary screen press the Create button to bring up the Filter Action screen 3 On the Filter Action screen enter a name for the fi...

Страница 147: ...Press the Next button to bring up the Filter Summary screen for this direction location 4 To delete or modify the filter select the filter from the pull down box and press Delete Modify This brings up...

Страница 148: ...12 14 CHAPTER 12 CONFIGURING FILTERS 840ug book Page 14 Friday July 7 2000 2 23 PM...

Страница 149: ...e 840 has a number of features which can be used to help troubleshoot problems They are especially useful if the OfficeConnect Remote 840 is not visible during the troubleshooting session OfficeConnec...

Страница 150: ...nager Refer to the OfficeConnect Remote 840 SDSL Router CLI User s Guide for more information Troubleshooting Tables The troubleshooting tables are organized in a bottom up fashion The hardware and li...

Страница 151: ...The MDI X switch on the back of the unit is set for connecting Port 1 to a single workstation but the cable is connected to a hub or vice versa Press the switch in to connect to a hub and out to conne...

Страница 152: ...a workstation to be on the same IP subnet as the OfficeConnect Remote 840 Then connect and use the OfficeConnect Remote 840 Manager 2 Use CLI to add an IP network over the Ethernet interface using an...

Страница 153: ...of the 840 while rebooting to delete the current configuration and select DHCP Smart Mode Unable to log in to the OfficeConnect Remote 840 You did not enter a valid administration login name and pass...

Страница 154: ...cable with another DSL cable There is a problem at the other end of the SDSL connection that causes the SDSL negotiation to fail Contact your service provider SDSL LED is Off or goes On briefly then...

Страница 155: ...or VDI error count is incrementing the problem may be an incorrect VC identifier Check the VC information and correct as needed Network Service RFC 1483 or PPP on OfficeConnect Remote 840 is incompati...

Страница 156: ...ther requests Try reaching another remote machine The remote network is responding inter mittently or not at all Monitor ATM shows ATM cell delineation successful but Hec sound is high There is a corr...

Страница 157: ...ion for excess noise which may be the reason the negotiated numbers are low Symptom Possible Cause Correction Action Symptom Possible Cause Corrective Action Remote IP network is not responding ex to...

Страница 158: ...ne of the following may solve the problem Remote WAN IP addresses are entered incorrectly Check the addresses and reconfigure as needed RIP may be turned off Set RIP to Listen mode to automatically le...

Страница 159: ...workstation s LAN address then try to run your video application again If it works check to see if your video application allows you to specify a static UDP port Microsoft NetShow allows you to config...

Страница 160: ...e Site IPX screens and ensure that IPX is enabled on both interfaces IPX routing table does not show a route to the remote network indicating a configuration problem One of the following may solve the...

Страница 161: ...s and ensure that bridging is turned on over both interfaces and that the remote site is enabled The IP network is not responding because the OfficeConnect Remote 840 is trying to route IP packets ins...

Страница 162: ...13 14 CHAPTER 13 TROUBLESHOOTING 840ug book Page 14 Friday July 7 2000 2 23 PM...

Страница 163: ...d satellite links In the following sections we describe the concepts behind bridging and routing and discuss the different ways in which LANs can be configured and operated to optimize performance and...

Страница 164: ...OfficeConnect Remote 840 to connect to the Internet you must configure the unit as a router If you want to link networks that the OfficeConnect Remote 840 is not routing you must configure bridging Th...

Страница 165: ...sses Some bridges allow address information to be manually configured into the bridge provided the automatic learning facility is turned off This will not normally prove necessary unless specific traf...

Страница 166: ...evices Building a Larger Network Large networks of interconnected LANs can be established by using multiple bridges as illustrated in Figure A 2 The bridges build up their address tables In Figure A 2...

Страница 167: ...etwork of interconnected LANs can be established by providing more than one link between any two of the LANs Normally this network would soon encounter serious problems resulting from a loop around wh...

Страница 168: ...f routers can effectively firewall one logical network from another Optimum Use of Resource Bridged networks use Spanning Tree Protocol STP to provide network resilience by retaining redundant links o...

Страница 169: ...ws workstations to communicate directly between one another A PC user wishing to communicate with a remote network server is totally unaware of any intervening bridges This is known as transparent ope...

Страница 170: ...ng the example in under Routing IP let us assume that a station on LAN 1 wants to communicate with a network server on LAN 2 The station on LAN 1 constructs a Layer 2 datalink header see Figure direct...

Страница 171: ...in its routing table information that will allow it to determine the best data transmission route The type of information the router uses to make these assessments is protocol dependent and some commu...

Страница 172: ...t are known as static routes which are manually entered fixed routes The network manager may be aware of specific traffic patterns or need to enforce a particular routing policy Static routes provide...

Страница 173: ...ter This allows you to accommodate varying network structures from a small number of network segments with huge numbers of nodes to large numbers of networks with only a few nodes Subnetting A large I...

Страница 174: ...ble values for the last octet byte in a Class C subnet mask Table B 1 Class C Subnet Masks One important thing must be noticed about the address divisions created by a subnet mask RFC 950 requires tha...

Страница 175: ...itself A packet with this address should never actually leave the machine that originated it Supernetting Advanced TCP IP Because Class B Internet addresses are in short supply larger networks are now...

Страница 176: ...ler supernet to share the address space of a larger supernet If for example you had a supernet of size 6 and a supernet of size 2 you could assign the larger supernet an 8 network address space and as...

Страница 177: ...e 32 bit limitation of an IP s address field When assigned an address by the NIC the address can be further broken down to expand the single net number to many more by using host bits IP Planning If y...

Страница 178: ...t that were assigned to the remote office Single IP Address If you are provided with a single IP address you ll use the OfficeConnect Remote 840 s Port Address Translation PAT feature The IP address w...

Страница 179: ...adcast addresses and cannot be used Also we were told that 2xx xxx 188 177 would be assigned to the OfficeConnect Remote 840 s LAN interface so we can t assign it to any other computer s on the LAN Ta...

Страница 180: ...red is used If the unnumbered scheme is used at only one end of the WAN link a single IP address is saved If it is used at both ends of the WAN link an entire IP subnet will be saved At first glance i...

Страница 181: ...mote destinations Therefore although you cannot PING or TELNET to the WAN interface when unnumbered is in use you can PING or TELNET the router using the IP address of a numbered interface Unnumbered...

Страница 182: ...B 10 APPENDIX B IP ADDRESSING 840ug book Page 10 Friday July 7 2000 2 23 PM...

Страница 183: ...e private addresses on small LANs and to use Address Translation when accessing devices on the public network Address Translation changes a private address to a public address at the gateway of a publ...

Страница 184: ...and a mask to be used for RIP messages if the public addresses are to be advertised Multiple pool and static assignments may exist within a pool range NAT Example Your remote site administrator or IS...

Страница 185: ...address translation table for the original private IP address The private IP address is put into a reply packet and sent to the Ethernet When all the pool addresses are in use any new requests are re...

Страница 186: ...when an application will initiate a TCP or UDP connection from the public network If a publicly accessible server resides on a privately addressed LAN static ports can be defined for the applications...

Страница 187: ...hen the packet is sent to the WAN The reply will contain the OfficeConnect Remote 840 WAN IP address and port number The port number is used to search the address translation table for the original pr...

Страница 188: ...efault PAT Default PAT operates like Dynamic PAT except you may specify a default private IP address for all traffic whose port numbers are not in the address translation table However this may remove...

Страница 189: ...site http www 3com com support ocr840 index html under User Documentation Accessing the CLI from the OfficeConnect Remote 840 Manager To use this feature from the Home page select the Tools link then...

Страница 190: ...D 2 APPENDIX D USING THE CLI GUIDE 840ug book Page 2 Friday July 7 2000 2 23 PM...

Страница 191: ...mmuting Remote Office Access Using the Configuration Audit Saving the Configuration Testing the Configuration Instructions for Internet Access Before you configure your OfficeConnect Remote 840 for In...

Страница 192: ...containing the following fields Enter a name to identify the remote site Enter the Max Packet Size Set Network Service to PPP over Frame Relay or RFC 1490 Enter the DLCI Check the Enable Bridging and...

Страница 193: ...me Relay or RFC 1483 If PPP enter the Authentication Name and Authentication Password provided to you You can change the header compression from the default of none to TCP IP if you wish Check Enable...

Страница 194: ...Configuration Planning Forms Enter the Virtual Path Identifier VPI and the Virtual Channel Identifier VCI for the virtual channel you are configuring If necessary enter any upstream Category of Servi...

Страница 195: ...be no IP address assigned to the VC connection Configure the Remote WAN IP Address If the ISP provided a remote IP address and netmask select Specified and type in that address and netmask If the Off...

Страница 196: ...t Enable IP is checked enabled 2 Press the Next button to proceed to the IP Advanced Modify screen This screen contains the following fields 3 Check the Enable PAT button to use Port Address Translati...

Страница 197: ...the Telecommuting Remote Access Planning Form from Chapter 1 of the Installation Guide by entering information from your remote site network administrator Step 1 Configuring Remote Site General Inform...

Страница 198: ...fields Enter a name to identify the remote site Set Network Service to PPP over Frame Relay or RFC 1483 If PPP enter the Authentication Name and Authentication Password provided to you You can change...

Страница 199: ...uration Planning Table in Chapter 1 of the OfficeConnect Remote 840 SDSL Router Install Guide 2 2 Enter the Virtual Path Identifier VPI and the Virtual Channel Identifier VCI for the virtual channel y...

Страница 200: ...IP Address If the remote site administrator provided you with a single IP address select Specified and enter that address If you are using PPP to assign a single IP address dynamically select Dynamic...

Страница 201: ...ly one remote site can be designated as the default gateway If you want to run RIP select from the pull down menu to have the RIP set to Broadcast Listen or Broadcast Listen and if one of these is cho...

Страница 202: ...ting IPX complete the entries in this page Otherwise press the Modify button to complete your remote site configuration and then press the Save Configuration button 2 Select the option in the IPX WAN...

Страница 203: ...nnect Remote 840 to bridge traffic follow these steps 1 From the OfficeConnect Remote 840 home page select Configuration Local Site LAN Bridge Add 2 Enter a name for the network and check the Enable B...

Страница 204: ...iguration Pressing the Save Configuration on the sidebar also within the Tools menu causes the current configuration of the unit to be saved to FLASH memory This means that this configuration will be...

Страница 205: ...om com This service provides access to online support information such as technical documentation and software library as well as support options ranging from technical education to maintenance and pr...

Страница 206: ...t phone number at the location nearest you When you contact 3Com for assistance have the following information ready Product model name part number and serial number A list of system hardware and soft...

Страница 207: ...ved B 2 translation 11 11 Address Resolution Protocol ARP table 11 9 Address Translation defined 1 8 advanced bridging options 5 9 RIP modification options 4 5 advertisement filters 12 3 assigning IP...

Страница 208: ...ote site connection 4 7 IP parameters for the remote site 4 7 IP RIP on a remote site 4 10 IP RIP on the LAN 4 5 IP static and framed routes 4 11 IPX for remote site connections 9 3 IPX for the LAN 9...

Страница 209: ...AN 4 5 IP testing PING 4 14 modifying a local IP network 4 4 monitoring 4 14 configuring IP static and framed routes adding a framed IP route to a remote site 4 11 adding a static IP route to the LAN...

Страница 210: ...bridge network 5 4 a local IP network 4 4 a login 2 2 a remote site profile 3 3 local IPX network 9 3 DIP switches 1 12 document notation 3 1 16 Domain Name Server DNS configuring 8 2 configuring rem...

Страница 211: ...ic filters 12 3 modifying filters using the OfficeConnect Remote 840 Manager 12 13 OfficeConnect Remote 840 Manager filter screens 12 6 overview 12 1 turning a filter off using the OfficeConnect Remot...

Страница 212: ...f IP addresses B 6 reserved addresses B 2 single IP address B 6 subnetting B 1 subnetting and the OfficeConnect Remote 840 B 4 supernetting advanced TCP IP B 3 IPX 11 13 network connection problems 13...

Страница 213: ...Connect Remote 840 11 1 remote site connections 3 8 monitoring the OfficeConnect Remote 840 address translation 11 11 ATM interface 11 5 bridge 11 14 Critical Event Log 11 16 DHCP 11 10 Ethernet perfo...

Страница 214: ...3 using 1 16 online help 1 17 technical services F 1 Open Systems Interconnection Network Layer Model A 8 optimum use of resource A 6 P physical layout A 6 Point to Point Protocol PPP benefits 1 7 def...

Страница 215: ...e adding 3 2 deleting 3 3 modifying 3 3 reserved addresses B 2 Reset button 2 4 resource optimum use A 6 restoring factory defaults 2 3 returning products for repair F 2 RFC 1483 benefits 1 7 defined...

Страница 216: ...tables IP TCP UDP ICMP 11 10 TCP counters 11 10 tables 11 10 technical support 3Com URL F 1 network suppliers F 1 product repair F 2 testing bridging 5 11 TFTP access 2 6 throughput performance 11 1...

Страница 217: ...10 1 OfficeConnect Remote 840 CD 10 2 via DOS 10 3 via OfficeConnect Remote 840 Manager 10 2 URL F 1 using OfficeConnect Remote 840 1 16 W WAN connection problems 13 6 interface events 11 16 Web brows...

Страница 218: ...840ug book Page 12 Friday July 7 2000 2 23 PM...

Страница 219: ...roduct not in accordance with 3Com s published specifications or user manual THIS 3COM PRODUCT MAY INCLUDE OR BE BUNDLED WITH THIRD PARTY SOFTWARE THE USE OF WHICH IS GOVERNEND BY A SEPARATE END USER...

Страница 220: ...RATION OF LAW STATUTORY OR OTHERWISE INCLUDING WARRANTIES TERMS OR CONDITIONS OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE SATISFACTORY QUALITY CORRESPONDENCE WITH DESCRIPTION AND NON INFRINGEM...

Страница 221: ...rient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from the one which the receiver is connec...

Страница 222: ...840ug book Page 16 Friday July 7 2000 2 23 PM...

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