HP VCX Software manual Tools, Packet Capture, Network Interface Selection, IP Address Selection

Chapter 12. Tools

Under Tools, you find handy tools to troubleshoot the Telecommuting Module setup.

Packet Capture

3Com VCX IP Telecommuting Module has a built-in packet capturer which can produce pcap trace files. This sniffer will capture all IP packets according to your selections, even those you can’t see in the log (like RTP packets).

The Telecommuting Module capturer needs to be manually activated and deactivated. As this produces a log which usually contains a lot more packets than the standard log, it is advisable only to run the capturer for short time periods.

The capture of the packets can be downloaded and analyzed in any tool that handles pcap traces, like Ethereal/Wireshark.

Network Interface Selection

Select on which interface or VLAN the sniffer should listen for packets. You can also select to listen on all interfaces.

Some network cards have VLAN hardware support. For this type of cards, incoming VLAN tagged traffic is not logged on the main interface, but only on the VLAN interface. Outgoing VLAN tagged traffic is logged on the main interface.

Other interfaces do not have VLAN hardware support. For this type of interface, VLAN traffic is logged on the main interface.

Currently, the only network cards in 3Com products to support VLAN are the Gigabit net- work cards.

IP Address Selection

You can limit the selection by specifying certain IP addresses.

In these fields, enter a single IP address (e. g., 10.3.27.3), a range of IP addresses (e. g., 10.3.27.1-10.3.28.254), an IP address followed by a netmask (e. g.,10.3.27.0/24), a combi- nation of these, or nothing at all. If a field is empty, all IP addresses are selected.

If you want to study all traffic except the one to or from a specific computer or group of computers, enter the IP address(es) here and mark the "not this address" box.

The selection can be modified by the control boxes under the fields A and B:

A src	Packets from the IP address in field A matches. Field B is ignored.
A dst	Packets to the IP address in field A matches. Field B is ignored.

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