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WebMux

™

Network Traffic Manager

User Manual

Virtual WebMux and Network Hardware Appliances

Version v13.x

(Rev September 2017)

WebMux chassis image represents models A425, A525, A620, A625, A725, A825

www.avanu.com

Summary of Contents for WebMux A425

Page 1: ...Mux Network Traffic Manager User Manual Virtual WebMux and Network Hardware Appliances Version v13 x Rev September 2017 WebMux chassis image represents models A425 A525 A620 A625 A725 A825 www avanu c...

Page 2: ...NENTS 9 Front View 9 Rear View 10 SECTION III WEBMUX TOPOLOGY OVERVIEW 12 WebMux Topology Modes 12 Two Armed NAT Mode 13 Two Armed Transparent Mode 19 One Armed Single Network Mode 21 One Armed Direct...

Page 3: ...nate way 44 Configuration Wizards 44 Command Line Interface CLI 47 Accessing the CLI 47 Initialization via CLI 47 CLI Commands List 48 Additional Command Line Interface Features 50 Adding Commands to...

Page 4: ...History 77 Miscellaneous 77 Show Events 77 Backup Restore 78 Set Clock 79 Banner 81 Upgrade 81 Wizards 82 TCPdump 83 Login 85 Logout 85 Reboot 86 Shutdown 86 Help 87 SECTION VI FARM MANAGAMENT AND HE...

Page 5: ...ver 2012 and newer 122 Weakhost Settings for Windows Server 2008 and Newer 124 Linux 2 4 2 6 Systems 125 SUSE Enterprise Linux 9 125 Hewlett Packard HP UX 11 00 and 11i 126 FreeBSD 126 Oracle Solaris...

Page 6: ...6...

Page 7: ...upporting an extensive range of applications and services Notice of Rights Copyright 2013 2016 AVANU Inc All rights reserved No part of any related WebMux documents may be reproduced or transmitted in...

Page 8: ...act Information Mailing Address AVANU 5205 Prospect Rd 135 143 San Jose CA 95129 5034 United States Service Center AVANU 15011 Parkway Loop Building 10 Suite D Tustin CA 92780 6522 United States Email...

Page 9: ...LAN Indicator Under normal operations this indicates activity on the Management LAN interface Even if the system is not running there is still standby power If there is an active Ethernet connection i...

Page 10: ...It goes through lower case letters upper case letters numbers and symbols Left Arrow Button and Right Arrow Button These move the cursor left and right into data entry fields and back Note that the C...

Page 11: ...auto sensed where straight or crossover cables can be used Link status LEDs will be lit when they are connected Network Traffic ports are the ports used for Internet to Server load balancing The ports...

Page 12: ...to the outside network will be seen as coming from the WebMux unit s Router LAN IP address or the front proxy address if you assigned one in the Network Management If a WebMux is placed behind a fire...

Page 13: ...he network to which the Internet router is connected The right side load balanced interfaces are connected to the Server LAN This network connects to all of the web servers The WebMux routes traffic b...

Page 14: ...14 and standby server In either case if Server 1 goes down Webux will redirect all traffic to Server 2...

Page 15: ...translates the router LAN IP addresses to private Class C addresses In this example the netmask is 255 555 255 0 The IP address of the WebMux interface on the router LAN is 205 133 156 220 The IP add...

Page 16: ...dress Although the WebMux can work with any IP address range all servers IP should be private addresses If there is a firewall between the WebMux and the Internet router a rule must be defined to allo...

Page 17: ...y s Backup interface IP address is 192 168 255 254 They cannot be changed Both WebMux units connect to the Router LAN and to the Server LAN Each WebMux interface has a unique IP address The IP address...

Page 18: ...ld be private addresses If there is a firewall between the WebMux and the Internet router a rule must be defined in the firewall to allow the IP address of the WebMux interfaces on the Router LAN in a...

Page 19: ...d Transparent Mode the servers need to be isolated from the rest of the network with the WebMux in between even though they are in the same network segment All communication from servers to other serv...

Page 20: ...lutely required that the WebMux units are connected in between two switches It is also very important to remember that you should not have any network path that will bypass the WebMux between the serv...

Page 21: ...You will not need to make any changes on your servers since the servers will always reply back to the WebMux when sending back their reply You will only need to connect the server LAN side of the WebM...

Page 22: ...traffic from servers back to clients is large amounts of data pictures or documents Using Direct Server Return Mode will allow up to 100 times more traffic to be handled by the WebMux load balancer Th...

Page 23: ...n this mode the server LAN Interface IP address which is the management IP address of the WebMux and the farm IP addresses If you are connected to a switch that allows you to create Link Aggregation G...

Page 24: ...efault gateway point to that IP address Link Aggregation Group Port Bonding in Direct Server Return DSR When the WebMux is in Direct Server Return mode the Internet and Server ports are configured in...

Page 25: ...gateway IP address The Server LAN gateway IP is the IP address that the servers behind the WebMux will use as their default gateway This is optional in Direct Server Return mode but is required in NA...

Page 26: ...were able to plug it back in the primary unit will not take back control unless you reboot the machine Upon reboot of the primary unit the secondary unit will return control to the primary unit when...

Page 27: ...that either the Internet port is used OR the Server port is used a Internet port not connected server port cable connected should NOT failover to secondary b Server port not connected Internet port c...

Page 28: ...28 e Multiple uplink gateways nexthop farm See the explanation in NAT mode...

Page 29: ...s of another set of servers on port 443 and the third farm works on a set of servers on port 21 The WebMux supports combining ports 80 and 443 one single farm so that same client browsing the site in...

Page 30: ...he existing configurations if needed Make a new drawing for the new setup with the WebMux and the web farm in place This will be used as a guide for setup and preparation of all the necessary material...

Page 31: ...appear Log into the web management interface The LCD Setup Screens Enter WebMux Host Name Enter the host name of the WebMux Use the right arrow to move the position the up and down arrows to select ch...

Page 32: ...des the convenience of preserving your server IPs but may require physical relocation of the network connection or modifying the default gateways DSR provides better performance when large amounts of...

Page 33: ...me resolution in UNIX or Linux operating systems In an installation with a primary and secondary WebMux a unique IP address is required for each WebMux interface that connects to the Server LAN Those...

Page 34: ...create a duplicate IP problem on your network and it cannot be the same IP you used in for the Server LAN IP In a single WebMux deployment it does not make a lot of sense to have two IP addresses on t...

Page 35: ...value for the VLAN IDs you will see an additional screen Bond rtr svr NI Bond router and server Network Interfaces This option will allow you to use the Internet rtr port and Server svr port as a sin...

Page 36: ...therwise you will create a duplicate IP problem on your network and it cannot be the same IP you used in for the Server LAN IP In a single WebMux deployment it does not make a lot of sense to have two...

Page 37: ...s the browser management console At that point clearing the allowed host file will allow any browser to access it By default the allowed host list is empty so that any IP address can access the WebMux...

Page 38: ...saved to the internal solid state storage Changes will take effect after next reboot The next question will be Reboot Now Reboot Now This is the end of initial configuration Most of the setup or chang...

Page 39: ...an additional option to Bond rtr svr NI This feature allows you to use the Internet and Server ports as a single bonded interface also known as Port Channel or Link Aggregation Group When this option...

Page 40: ...ged packets and automatically assign a VLAN ID to those packets In this case you will be using VLAN ID 100 First you will configure ports 3 4 5 and 6 to participate or include VLAN 100 and make sure t...

Page 41: ...work To set up a static IP address on this port hold down the X button on the LCD panel for at least 3 seconds Enter the IP address and netmask you want to use It is recommended that you do not config...

Page 42: ...er s password is superuser However the actual superuser s password may have been changed by the system administrator If you could not remember the superuser s password someone has to go to the keypad...

Page 43: ...nto a field to see the current values The user may change it based on new information obtained from ISP or network engineers Once you press on the submit button the WebMux will save all the changes to...

Page 44: ...for more details on accessing the regular management console Configuration Wizards The WebMux includes configuration wizards for quick deployment of the WebMux dispatch method and farm configurations...

Page 45: ...Generic HTTP HTTPS Microsoft Exchange Microsoft Lync Microsoft SharePoint RedHat JBoss Eclipse Jetty LiteScape Pexip Apache Tomcat Oracle WebLogic IBM WebSphere The wizards are laid out and operate i...

Page 46: ...46 WebMux has rebooted and comes back online you can log in to the regular WebMux GUI and make modifications to the resulting configurations...

Page 47: ...E serial number VX 000XAA0A0 manufactured May 09 2016 CPU speed 2332 880 MHz CPUs 1 total memory 2052176 k configured as two armed server LAN NAT management interface IP address 192 168 15 159 Enter h...

Page 48: ...nusable this will change the default boot partition to the other one brctl manually manipulate Ethernet bridge properties when the WebMux is in Transparent Mode checkssl verifies key and certificate F...

Page 49: ...outing tables interface statistics etc nwconfig allows you create additional networks for use in multiple ISP configurations and or for multiple server subnets in NAT mode Reference the Multiple Uplin...

Page 50: ...Command Line Interface Features Adding Commands to WebMux Startup Sequence Sometimes there is a need to add commands to the WebMux startup sequence so that certain commands can be reboot persistent Th...

Page 51: ...sysinit table Please note that sysinit table will not be send over to the backup WebMux In case the wrong command caused user no longer able to login into WebMux use the LCD factory reset to reset the...

Page 52: ...the same tagged VLAN ID There are some specific considerations when configuring VLAN IDs in NAT Transparent or Out of Path Mode In NAT mode you have the option to have a VLAN ID for both the Router In...

Page 53: ...ete NAME nwconfig I install NAME nwconfig L list PATTERN nwconfig R replace NAME i ipaddr IPADDR other options nwconfig U uninstall NAME For the A or add option the i or ipaddr option is required but...

Page 54: ...00 In NAT mode if you do not specify a gateway IP the new network will be put on the Server LAN side If you will be pairing up WebMux units in a failover configuration we recommend that you perform th...

Page 55: ...IP Since only the active WebMux will have this IP enabled on its interface you will not have a duplicate IP address between both units If one unit goes out of service the IP address becomes available...

Page 56: ...IP that transfers between WebMux units in a failover configuration Only the active WebMux will have that IP address available on its network interface to avoid duplicate IP address issues Additional n...

Page 57: ...running the device IP s CPU usage memory usage link status of the network interfaces current hardware date and time and uptime This pane also contains clickable elements The menu element will hide or...

Page 58: ...hat means the page will arrange itself to accommodate the smaller size of a mobile screen or if the desktop browser window is adjusted to a small enough dimension The responsive web GUI design helps m...

Page 59: ...port 24 for unsecured communications The port number can be changed per your specification in the network admin section of the network menu The following login page will appear In order to use a brows...

Page 60: ...o to the network admin screen within the network menu section and change the WebMux HTTP control port number to 0 For customers who have configured TACACS or LDAP support the login screen will display...

Page 61: ...imeout value to a larger value Many times servers try to and cannot resolve the IP address of WebMux server LAN interface and could cause the server to not respond to the WebMux unit s protocol checki...

Page 62: ...of the screen on a touch screen the updating will pause until you move the mouse elsewhere or touch another part of the web GUI SSL The second item in the main menu section is the link to the SSL mana...

Page 63: ...oots Time Period to Display Adjust the the time span of the history you would like to view by selecting from the drop down menu 2 weeks 1 week 1 day 12 hr 8 hr 4 hr 2 hr Rate to Display Select the inf...

Page 64: ...ngs next These settings can always be changed later in the future as needed Note that some setting will require a reboot of the WebMux to take effect IPv6 96 bit Address Prefix To load balance in IPv6...

Page 65: ...25 Other protocols you can use are msa or submission both will default to port 587 If only an IP address is entered smtps is assumed and will default to port 465 Non standard ports can be specified i...

Page 66: ...Farm network mask below first Also when setting up the servers you may be asked to fill in the default gateway IP address for the server It is important to reiterate that THIS IS NOT INTERNET ROUTER F...

Page 67: ...ssh login is possible You will need to notify us the port numbers before obtaining support from us WebMux Failover Ports The WebMux allows configuration of failover ports being used by primary and bac...

Page 68: ...to use to check the front network It can be the router in front of the WebMux or a router in your ISP s WAN It can be any address that is reachable through your Internet side The protocol specified in...

Page 69: ...e connections The default setting is YES to conserve resources Front Proxy Addresses By default the WebMux will use the main IP address you configured in the router internet LAN interface or Bridge IP...

Page 70: ...e unsaved changes and want to quickly revert back to your previously saved settings select restore last saved table from the drop down menu and click the submit button To get to the CLI you can either...

Page 71: ...onfigure button will bring you to the initial network settings page Additional details about this can be found under the Initial Setup Through a Web Browser section in SECTION IV CONFIGURING THE WEBMU...

Page 72: ...any IP address that is configured It is recommended to set this up for security reasons If the wrong IP addresses are entered the Web Management Administrative Console login might not be possible Use...

Page 73: ...xtremely high Assuming they exceeded the value set for the connection warning threshold the designated numbers would be paged ICMP Packet Input Policy Accept The WebMux will allow all ICMP packets to...

Page 74: ...a notification page stating so and you will need to try again Submit Click submit to execute the change Change PIN To protect the WebMux from unauthorized changes from the front LCD panel a PIN can be...

Page 75: ...to allow certain IPs to make connections that may appear to be attacks For example if you have a third party company that regularly benchmarks your services for maximum load handling you will need to...

Page 76: ...ne in bursts rather than large streams While the packet rate parameter will control the maximum allowable steady rate of packets the packet threshold detects the maximum allowable packet bursts Timeou...

Page 77: ...he past and current blocked and released IP addresses Miscellaneous Show Events This page will show you the history of WebMux events such as detection of server dead status Events will be saved past r...

Page 78: ...at not only includes the farm server configurations and settings but all other settings just as the units main IP addresses settings from the network administration and so forth This file cannot be ed...

Page 79: ...W3C HTTP protocol If the time zone is not set correctly the browser access could be denied due to cookie time out If the UDP NTP server is set up correctly there is no need to set the clock anymore s...

Page 80: ...nter the year Enter all 4 digits Hour Enter the hour of the day Use the 24 hour clock military time Minute Enter the minute of the hour Time Zone Select the time or hour offset to the UTC GMT time You...

Page 81: ...rade the WebMux firmware you will first need to contact WebMux support at techsupport avanu com and request for the latest firmware image Save that image to your local computer and use the Browse butt...

Page 82: ...wizard is a single form with the sections done in an accordion style interface Each heading will expand a section Each section will contain specific instructions Please read carefully the instructions...

Page 83: ...traffic diagnotics You can use this to check if hosts are passing through the WebMux or to check if the WebMux is sending packets to the proper distination among other things For more advanced tcpdump...

Page 84: ...you want to capture Port number Specify the port you want to filter for Count This will stop the capture when this number of packets have been reached Timeout in seconds This will stop the capture whe...

Page 85: ...ON When you log in as a different user the old session will end However we normally recommend that you correctly end your current session by using the Logout from the drop down menu Logout It is not r...

Page 86: ...t significant bits forwarding policy front network verification and persistence timeout many other fields that are marked with an asterisk require a reboot for the new configuration to take effect You...

Page 87: ...windows to take you to the www avanu com support pages About WebMux This will take you to the about screen of the WebMux Here you will see information about your WebMux unit such as the firmware vers...

Page 88: ...he farm entry It can be any alphanumeric text Farm IP Address This is the IP address of the new farm For SSL terminated traffic each farm must have its own IP address If your WebMux is on the public I...

Page 89: ...l hosting the virtual host name field must be an existing web site name on the server Virtual Hosting Issues Servers serving more than one web site may do virtual hosting The WebMux supports virtual h...

Page 90: ...field However if the service you choose is not listed in the list below you will need to specify a port number here For example for Microsoft Terminal Services use port number 3389 If you enable SSL t...

Page 91: ...o Health Check TCP User Specify Generic No Health Check UDP User Specify Generic No Health Check TCP UDP User Specify Custom Defined Services TCP User Specify Custom Defined Services Generic TCP User...

Page 92: ...m services specifying the clear traffic port for the service in the port number section causes the WebMux to automatically assume the secure port for the following services CLEAR TRAFFIC PORT SECURE P...

Page 93: ...P If the Multiple Address Ports feature is going to be used this must be selected upon creation of the farm This cannot be set or disabled once the farm is created You will need to delete and recreate...

Page 94: ...okie MIME header of the HTTP request is examined for a match Only matching requests will continue through to be forwarded to the servers in this farm Layer 7 Host MIME Header Perl Regex Match When a s...

Page 95: ...of labeling a server is only to help identify the server in the farm It has nothing to do with the name resolution of the server Although a label can be anything it is always better to have a meaningf...

Page 96: ...immediately after it is added If there are servers in the farm in Standby the WebMux will activate a Standby server in its place if it goes out of service When the original server comes back in servi...

Page 97: ...eck The WebMux uses the data in this field as the host name for the HOST mime header in its HTTP health check requests to the servers In some cases name based virtual hosts have a default site that wi...

Page 98: ...ou can specify your own This does not necessarily need to correlate to the SSL port of the servers behind the farm unless their ports will be configured as same when adding them Block Non SSL Access t...

Page 99: ...link to delete the farm If you click on this link and you have not selected a farm from the main screen you will see a notification instructing you to select a farm If you click on this link while in...

Page 100: ...Although all numbers from 1 to 100 will allow traffic to go through using a smaller weight number in each server will have the best load distributing result Run State Active The server will be put int...

Page 101: ...nk and you have not selected a server from the Main Status screen you will see a notification instructing you to select a server If you click on this link while in a different screen You will see a no...

Page 102: ...Mux to perform a correct health check The WebMux uses the data in this field as the host name for the HOST mime header in its HTTP health check requests to the servers In some cases name based virtual...

Page 103: ...will be automatically filled in You can manually change it if you are using a different port for that service Block Non SSL Access to Farm Prohibits non SSL connection to this MAP instance Tag SSL te...

Page 104: ...back to the Main Status screen where you can select a MAP you want to delete You can also detele a MAP by clicking on the the MAP IP link on the Main Status screen which will take you to the modify ad...

Page 105: ...al Click the Submit button to create the gateway farm Your status screen will look something like this Your original default external gateway will be automatically added to the gateway farm Click on t...

Page 106: ...bel The label here is used only for reference purposes Weight This is for scheduling priority weight Valid integer numbers are between 1 and 100 Run State Active The gateway will be put into service i...

Page 107: ...ateway will be put into STANDBY state Unless all other gateways are out of services this gateway will not be switched in Back at the main status page of the web GUI you will notice that the farm IP ad...

Page 108: ...lect a farm using the radio button from the Main Status screen Once you have selected the farm you can click on this link to get to the Modify Service Timeout screen You can also get to this screen by...

Page 109: ...he health check TCP timeout value Modify Timeouts will allow you to change the health check timeout period the amount of time the WebMux will wait for the server to reply to its health check probe Not...

Page 110: ...database server connection is down one might want to reduce the incoming traffic to the server suspend new traffic to the server or totally redirect incoming traffic to a different server To accomplis...

Page 111: ...esponse from server goes here see list below echo SSH service available else echo NOT OK echo SSH daemon not running fi The following is a list of valid CGI code responses OK server service is alive n...

Page 112: ...an utilize for your custom health check script Please refer to your HTTP server manual and the manual for your scripting language for more information about environment variables If you select Custom...

Page 113: ...just make sure you have a valid file at the location specified in the URI for custom service check field HTTP By default HTTP servers return code 200 to indicate a successful result Sometimes a differ...

Page 114: ...92 bit Each WebMux can hold 100 SSL key and certificate pairs The key and certificate pair is activated by selecting in in the add farm or modify farm screens The first line of the private key is a co...

Page 115: ...eboot the WebMux to activate changes If you decide not to reboot existing farms will run under the previous criteria and new farms will follow the new criteria Rebooting the WebMux will ensure that AL...

Page 116: ...management screen browsers over the Internet will accept it without complaint during the lifetime assigned to the key You can visit www thawte com or www verisign com for more information After submit...

Page 117: ...ng signed keys from a Windows IIS server or a Linux server you can transfer them into the WebMux and continue using them until they expire You should be able to directly transfer your existing key and...

Page 118: ...pasted in Next open your certificate PEM fil in a text editor Copy the text starting with BEGIN CERTIFICATE all the way to END CERTIFICATE Paste the text into the certificate text box and select use...

Page 119: ...efault Gateway or DNS for this loopback adapter Click Apply then OK then Yes when prompted to restart the computer For Microsoft Windows 2003 Server make sure the metric is the highest number in the r...

Page 120: ...root device the PC name Under the Action menu select Add legacy hardware On the next screen select Install the hardware that I manually select from a list Advanced Then select Network adapters and cli...

Page 121: ...121 On the next screen select Microsoft on the left pane and Microsoft KM TEST Loopback Adapter on the right pane Proceed throught the installation process...

Page 122: ...utton when complete Configuring the Microsoft Loopback Adapter Windows 8 Server 2012 and newer Open the Network and Sharing Center from the Control Panel Find the Change adapter settings link on the l...

Page 123: ...Adapter and select Properties In the next window highlight Internet Protocol Version 4 TCP IPv4 and click on the Properties button In the Internet Protocol Version 4 TCP IPv4 Properties screen enter...

Page 124: ...ith Windows Server 2008 the default networking has moved to the strong host model as outlined in RFC 1122 You need to use the following command line netsh interface ipv4 set interface net weakhostrece...

Page 125: ...ress of the FARM to lo adaptor Also be sure that the routing table has an IPv6 entry for the network and a default gateway entry for the real interface of the server You can check by issuing the route...

Page 126: ..._address up FreeBSD ifconfig l o0 inet farm_ip_address netmask 255 255 255 255 alias Oracle Solaris ifconfig lo0 1 FARM_IP_ADDR ifconfig lo0 1 FARM_IP_ADDR FARM_IP_ADDR ifconfig lo0 1 netmask 255 255...

Page 127: ...ct Farm Creating an HTTP to HTTPS redirect farm is the same as creating any other farm entry The most important thing is to select HTTP to HTTPS redirect as the scheduling method Label This is for you...

Page 128: ...ps domainname com location Completing the HTTP to HTTPS Redirect Configuration After you have created this HTTP to HTTPS redirect farm it is important that you remember to create the HTTPS farm that w...

Page 129: ...Address Router LAN Network IP Address Mask Router LAN VLAN ID optional Server LAN Information NAT and OOP Server LAN WebMux IP Address Server LAN Gateway IP Address optional for OOP Server LAN Networ...

Page 130: ...n Server LAN WebMux IP Address 192 168 199 251 Server LAN Gateway IP Address 192 168 199 1 Server LAN Network IP Address Mask 255 255 255 0 Server LAN VLAN ID optional 102 Administration Setup Informa...

Page 131: ...0 Bridge IP Network Mask 255 255 255 0 WebMux farm IP Address 205 133 156 200 front Router LAN VLAN ID optional 101 back Server LAN VLAN ID optional 102 Administration Setup Information External Gatew...

Page 132: ...erver add loopback adapter 10 1 1 200 Route Deletion 10 1 1 200 Administration Setup Information WebMux External Gateway IP address 10 1 1 1 Remake home WebMux conf passwd Y Administration HTTP Port N...

Page 133: ...WebMux Proxy IP Address 205 133 156 200 205 133 156 200 Router LAN Network IP Address Mask 255 255 255 0 255 255 255 0 Router LAN VLAN ID optional 101 101 Server LAN Information Server LAN WebMux IP...

Page 134: ...Will a server with weight 0 act as a STANDBY No A weight of 0 indicates that the server will not accept any new connections The state is considered neither ACTIVE nor STANDBY This is to quiet the new...

Page 135: ...he WebMux as a proxy server for other hosts in my internal network Yes The function that allows the web servers to talk to services such as the credit card validation allows the WebMux to function as...

Page 136: ...cannot reach to the front router LAN gateway or if it cannot see any server in any farm then it will consider that the primary was disconnected or powered down purposely by operator Why can t VLAN IP...

Page 137: ...or return prior to thirty days 30 of receiving product Upon approval a RMA number will be issued by AVANU s Customer Service for the return and must be visible on the outside shipping container Custom...

Page 138: ...am to 5 00 pm Pacific time Product technical support Monday to Friday except US Holidays 8 00 am to 5 00 pm Pacific time Premium Annual Service Program First year must be purchased with the WebMux pr...

Page 139: ...Responsibilities In order to avoid the risk of charges for issues not covered by your limited warranty issues that are not due to defects in materials and workmanship on AVANU WebMux products you wil...

Page 140: ...ONS INTENDED FOR THE WEBMUX PRODUCT About the Support Disclaimer The Support provision covers product configuration and basic remote installation support up to the first sixty days 60 from purchase da...

Page 141: ...required for all warranty repair service or sales returns AVANU has the right to refuse any shipment without a RMA number AVANU has the right to offer promotional programs at any time where the Limit...

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