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Tech Tips

• Is the LCD utility supported on Windows 2000?
• Does the Omnipliance support 10 Gig networks?
• Why aren’t my Statistics Output Reports being output when I set them to?
• Can I change my adapter buffer size?
• Can I make changes to the built in WildPackets Gigabit card?
• Why am I receiving bad checksum messages on some outgoing packets?
• Why are some of my outgoing packets unusually large?
• Can I change the VoIP region settings?

Is the LCD utility supported on Windows 2000?

The Omnipliance and the LCD utility is designed to run on Windows Server 2003.

Does the Omnipliance support 10 Gig networks?

Yes, Omnipliance does support 10 Gigabit capture and analysis. Please visit http://www.wildpackets.com/products/analysis_cards/10GbE for more information.

Why aren’t my Statistics Output Reports being output when I set them to?

When doing Statistics Output, setting the output interval too low may cause some reports to not be output when intended. If reports are not being output at the desired time, you may wish to increase the output interval.

Can I change my adapter buffer size?

Adapter buffer size in the Adapters view does not apply to the OmniEngine Linux. The default buffer size for all installed adapters is set to “0”.

Can I make changes to the built in WildPackets Gigabit card?

Making changes to WildPackets Gigabit capture cards is not recommended unless using OmniPeek or the OmniEngine Manager.

Why am I receiving bad checksum messages on some outgoing packets?

This problem may be caused by the network card’s ability to offload the calculation of IP, TCP, and/or UDP checksums from the TCP/IP protocol stack. If the OmniEngine Linux is sending the packets, the checksums may appear incorrect if the hardware is calculating the checksums. A work around is to disable this feature on the network card. The following command will turn off the feature for the specified adapter in the OmniEngine Linux computer:

ethtool –K eth# tx off (where # is the adapter index)

Note: The adapter must be in a ‘down’ state for the change to take effect. The change will not persist across a reboot.

Why are some of my outgoing packets unusually large?

This problem may be caused by the network card’s ability to offload TCP/IP protocol stack. If the OmniEngine Linux is sending the TCP packets, some of these packets may be unusually large if the hardware is doing the segmentation. A work around is to disable this feature on the network card. The following command will turn off the feature for the specified adapter in the OmniEngine Linux computer:

ethtool –K eth# tso off (where # is the adapter index)

Note: The adapter must be in a ‘down’ state for the change to take effect. The change will not persist across a reboot.

Can I change the VoIP region settings?

Yes, you can edit the omni.conf file (/etc/omni) to change the VoIP region. The omni.conf file lists the possible values. Restart the OmniEngine Service for the changes to take effect.