Common Problems

This section discusses the following common problems and their potential solutions:


LAN Connectivity Problems

To verify that NIC is grouped, do the following:

  1. Load INETCFG and select Bindings > TCP/IP.

  2. Select Configure TCP/IP Bind Option.

  3. Make sure that the Group interface for LBFT is set to Yes.

To check that fault tolerance is enabled, do the following:

  1. Load INETCFG and select Protocols > TCP/IP.

  2. In the screen that appears, fault tolerance should be enabled.

    This could be for the complete system. You still need to verify whether Fault Tolerance is enabled for the particular Net Group.

  3. Select Fault Tolerance Configuration > Configure Individual Group.

  4. Select the particular Net Group and check whether fault tolerance is enabled for it. If not, set it to Yes.


Router Cannot Ping a Remote Router or the Internet

Load TCPCON and verify select IP Routing Table that there is a destination that is specified as the default route. If there is no default route, you must configure it. Load INETCFG to permanently configure the default route.

  1. Load INETCFG and select Bindings > TCP/IP.

  2. Select the Interface Group for your WAN card.

  3. Select WAN Call Destination.

  4. Select WAN Call Destination press Ins and then select the WAN card defined earlier.

  5. Select Static Routing Table option and press Ins.

    The Static Routing entry sets up the default route that points to the Internet Service Provider (ISP).

  6. Select Route to Network or Host > Default Route.

  7. Press Esc to save your changes and exit the menus.

  8. For the changes to take effect, reinitialize the system.


Routing Table Maintenance Problems


IP Address Duplication across Machines


Server Not Responding under Heavy Stress Conditions

Increase the following using the SET command options:

Maximum Packet Receive Buffers

Minimum Packet Receive Buffers

TCP IP Maximum Small ECBs


Load Not Balanced across NICs although LB is enabled in INETCFG

Load balancing might have been enabled only for the system and not for the particular group. Check whether you have grouped multiple NICs and enabled load balancing for them.

To check that load balancing is enabled at group level, do the following:

  1. Load INETCFG and select Protocols > TCP/IP.

    In the screen that appears load balancing should enabled. This is for the complete system. You still need to verify whether load balancing is enabled for the particular Net Group.

  2. Select Load Balancing Configuration > Configure Individual Group.

  3. Select the particular Net Group and check whether load balancing is enabled for it. If not, set it to Yes.


Network Traffic Is Not Balanced across NICs

To check whether a particular binding is part of the LBFT Group, do the following:

  1. Load INETCFG and select Bindings > TCP/IP.

  2. In the screen that appears, select the Configure TCP/IP Bind option.

  3. Make sure that the group interface for LBFT is set to Yes.


Losing INETCFG Configuration Information upon Rebooting

This could happen if the server abended while being configured. This corrupts the file SYS:\ETC\TCPIP.CFG. Delete this file and copy a backup of the previous configuration.


Loss of Secondary IP Address upon Deleting Any Binding

This could happen if more than one interface are using the same driver. If this is the case, never delete any of the bindings. Always disable them if you don't want to use them.



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