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Packet capturing in Linux

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To Yiew the packets quickly:

tcpdump -qnnpi eth0

To Yiew all the packets in ASC,, format:

tcpdump -Annpi eth0 Here are a few simple tricks for using the tcpdump command.

To Yiew all packets in the Hex and ASC,, formats:

tcpdump -Xnnpi eth0

To Yiew packets with the L2 layer:

tcpdump -eqnnpi eth0

To saYe the captured packets:

tcpdump -qnnpi eth0 -w capture.pcap

capture.pcap can be opened using the famous tool Wireshark.

—Prasanna, prasanna.mohanasund­aram@gmail.com

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