Hi, I am using tcpdump to analyze the
network performance.  Right now, it only
give me header infomation, how can I
get the total packet?
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You can increase the amount of data shown by tcpdump with the "-s" option, but you have to be cautious as noted in the man page.

To be able to see the entire packet, you should run tcpdump with its output sent to a file (-w option). You can then "replay" the file and see whole packets (-r -x options).

If you need to see whole packets in realtime, there are other tools more suitable than tcpdump. Some are free, others are commercial, it would probably be worth your time to do a litle web research and see if there's one more suitable for what you're trying to do,

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