VoIP Ethernet Capture TMG800
Applies to version(s): v2.7
Capturing using the TMG800's internal host
The TMG800's internal host can be used for capturing packets that are mirrored from the VOIP0 and/or VOIP1 physical ports. This includes RTP traffic.
Start Capture
You need two SSH sessions to capture the traffic:
First, access the Tmedia management interface using SSH. Then, access the telecom baseboard using
telnet 172.31.1.1
Prompt is now
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To capture VoIP0 traffic:
mv88eMonitor 0x1 0x1 2 600
To capture VoIP1 traffic:
mv88eMonitor 0x2 0x2 2 600
In the example the duration is 600 seconds, thus will capture traffic for 10 minutes.
Note: We don't recommend to keep the capturing for a long time. This is only for debugging purpose.
Second, access the Tmedia management interface using SSH.
Prompt is now
[root@TBxxxxxx ~]#
To dump the content of the VOIP traffic in the file voip_capture.cap
tcpdump -i mgmt0 -s 1500 -w voip_capture.cap
You will see something like this:
tcpdump: listening on mgmt0, link-type EN10MB (Ethernet), capture size 1500 bytes
Stop Capture
When you're ready, stop the capture by pressing control-C on the shell that was running tcpdump command
You will see something like this:
364 packets captured 590 packets received by filter 0 packets dropped by kernel
- Access the telecom baseboard from the Tmedia using telnet.
telnet 172.31.1.1
- Stop the capture
mv88eMonitor 0 0 0
Download Capture
To download the voip_capture.cap file, use SSH secure copy ("sftp") to the Tmedia management port. This can be done on Windows using tools like Filezilla or WinSCP.
The file will be located in
/root
