Tcpdump patterns: Difference between revisions
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(New page: On http://danielmiessler.com/study/tcpdump_recipes/ I found this nice list: <pre> Show me all URG packets: # tcpdump 'tcp[13] & 32 != 0' Show me all ACK packets: # tcpdump 'tcp[13] & 16 ...) |
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# tcpdump 'tcp[13] = 18' | # tcpdump 'tcp[13] = 18' | ||
</pre> | </pre> | ||
To show incoming nsupdate queries run the following: | |||
<pre> | |||
tcpdump port 53 and 'udp[10] = 0x28' | |||
</pre> | |||
Also see [http://acs.lbl.gov/~jason/tcpdump_advanced_filters.txt this page] for much more on bit matching with tcpdump. | |||
Revision as of 02:32, 2 August 2009
On http://danielmiessler.com/study/tcpdump_recipes/ I found this nice list:
Show me all URG packets: # tcpdump 'tcp[13] & 32 != 0' Show me all ACK packets: # tcpdump 'tcp[13] & 16 != 0' Show me all PSH packets: # tcpdump 'tcp[13] & 8 != 0' Show me all RST packets: # tcpdump 'tcp[13] & 4 != 0' Show me all SYN packets: # tcpdump 'tcp[13] & 2 != 0' Show me all FIN packets: # tcpdump 'tcp[13] & 1 != 0' Show me all SYN-ACK packets: # tcpdump 'tcp[13] = 18'
To show incoming nsupdate queries run the following:
tcpdump port 53 and 'udp[10] = 0x28'
Also see this page for much more on bit matching with tcpdump.
