July 2017
Intermediate to advanced
434 pages
12h 59m
English
Content preview from FreeSWITCH 1.8
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tcpdump for saving net traffic in pcap files
When you ask for help in Real Time Telecommunication you will often (always?) be asked to provide a "pcap" file of your network traffic including the problematic session. Also, you will often want to remotely save the traffic in a file that you will later analyze (with sngrep or wireshark, etc).
The tcpdump utility is almost guaranteed to be available on any kind of operating system. Its most basic usage (save all the traffic sniffed by the Ethernet interface) is:
tcpdump -nq -s 0 -i eth0 -w /tmp/dump.pcap
You can filter what you save to only packets incoming and outbound from/to port 5060 (no protocol specified, so both TCP and UDP, full "traditional" SIP signaling):
tcpdump -nq -s 0 -i eth0 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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