Cadence Flash F200-2 Guía para resolver problemas descargar pdf (Pagina 34)

34 Troubleshooting

The MGC and MC32S cards can mirror a port without using an external

hub or switch.

Collecting sniffer captures

To facilitate analyzing and cross-referencing sniffer captures, ensure the

PC, on which the sniffer runs, has the same date an time on the device

being sniffed. Because hundreds of packets can be generated within a few

seconds, synchronizing the time to the second is recommended.

Use the capture filters to reduce the amount of captured information

(unless capturing everything can provide clues to the root of the problem).

For instance, create a filter with the VGMC or Signaling Server TLAN

interface and the IP address of the IP Phone being debugged. First, create

a new profile. Then modify the address parameters of the profile for the

VGMC/Signaling Server TLAN and the IP Phone address. Finally, select

the filter before you start the capture.

Note: Be sure to select IP for the Address Type. If set to Hardware,

the MAC address of the endpoints is expected but the program allows

you to enter an IP address; you receive no indication of any problem

until you receive an "Invalid Hardware Address" error when you try to

capture using the filter.

Use the display filters to filter information from a capture file while you

diagnose a problem. A new window appears each time an applied filter

changes the contents. You can save only those windows with useful

information. The process create the filter and selecting it is the same

process you use for the capture.

After you stop the capture, display it. Select the Decode tab on the expert

window to see the packet information. If you installed the UNIStim or

RUDP packet decode package, the contents of the UNIStim and RUDP

messages are decoded as well as all default protocols (IP, TCP, and

RTP).

The Matrix tab shows the communication between various devices as

detected by the sniffer. On the Matrix tab, you can filter by selecting an IP

address and clicking the Filter button. This procedure shows all traffic send

and received by the device that uses the selected IP address.

The Host Table lists statistics for each host in the capture, while the

Statistics tab shows overall statistics.

Ping and Traceroute are available on the Tools menu.

Nortel Communication Server 1000

Troubleshooting Guide for Distributors

NN43001-730 02.02 31 December 2009

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Cadence Flash F200-2 Guía para resolver problemas Pagina 34