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Date:      Thu, 16 Nov 2000 09:33:43 +0800
From:      "Tan Wei Chong" <weichong78@bsdmail.org>
To:        freebsd-net@FreeBSD.org
Subject:   tcpdump newbie
Message-ID:  <20001116013343.10116.qmail@bsdmail.org>

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hi,
can anybody help me to clarify which host/port/interface i should capture if i were to do performance compare between a tunnel 6to4/4to6 (IPv6 tunnel into IPv4 and IPv4 tunnel into IPv6) HTTP/1.1 traffic.
Should I issue:
tcpdump -i fxp0 
tcpdump -i gif0 (i use gifconfig for the tunneling)
tcpdump host <IPv6 addr> and <IPv6 addr>
tcpdump host <IPv4 addr> and <IPv4 addr>
tcpdump src port <http server address>
???
because so far all the tunnel communication that I try to capture seems to yield empty packets when analyze using tcptrace, however pure IPv6 to IPv6 or IPv4 to IPv4 communication does give result.
Note: the 2 host is link-local and isolated from any other computer

Thank you.
Wei Chong
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