May 2017
Beginner
552 pages
28h 47m
English
Content preview from Linux Shell Scripting Cookbook - Third Edition
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Viewing the packet payload as well as headers
If you need to track down the host that's swamping the network, all you need is headers. If you are trying to debug a web or database application, you probably need to see the contents of the packets as well as the headers.
The -X flag will include the packet data in the output.
The host keyword can be combined with port information to limit the report to data to and from a given host.
The two tests are connected with and to perform the Boolean and operation, and they report only those packets that are to or from noucorp.com and/or the HTTP server. The sample output shows the start of a GET request and the server's reply:
$ tcpdump -X -r /tmp/tcpdump.raw host noucorp.com and port http reading ...
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