Tuesday, January 25, 2011

Using tcpdump to sniff HTTP traffic from a specific host

This is mostly just a reminder to myself about my preferred parameters to tcpdump on linux, so that I don't have to keep reading the man page.

tcpdump -c 20 -s 0 -i eth1 -A host and tcp port http

The parameter breakdown:
  • -c 20: Exit after capturing 20 packets.
  • -s 0: Don't limit the amount of payload data that is printed out. Print it all.
  • -i eth1: Capture packets on interface eth1
  • -A: Print packets in ASCII.
  • host Only capture packets coming to or from
  • and tcp port http: Only capture HTTP packets.


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