Monday, November 22, 2010

Capturing via tcpdump to view in Wireshark

$sudo tcpdump -i en1 -s0 -w captured.pcap

-i Listening interface

-s Snarf snaplen bytes of data from each packet rather than the default of 64K bytes. Packets truncated because of a limited snapshot are indicated in the output with ``[|proto]'', where proto is the name of the protocol level at which the truncation has occurred. Note that taking larger snapshots both increases the amount of time it takes to process packets and, effectively, decreases the amount of packet buffering. This may cause pack- ets to be lost. You should limit snaplen to the smallest number that will capture the protocol information you're interested in. Setting snaplen to 0 means use the required length to catch whole packets.


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