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tcpdump on tap100: no packets shown, even though they arrive/get replied to


Just noticed this;

15:18:05.215970 00:16:3e:be:ef:03 f2:0b:a4:63:80:03 0800 98: > icmp: echo request
15:18:05.216021 f2:0b:a4:63:80:03 00:16:3e:be:ef:03 0800 98: > icmp: echo reply

That's on machine B.

On machine A (the one replying to the ping), # tcpdump -peni tap100

tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on tap100, link-type EN10MB (Ethernet), capture size 65535 bytes

machine A is a 5.99.55 kernel+world built  Tue Aug 23 12:05:48 UTC 2011,
tap100 is on bridge3 which is passed as an interface to machine B (a Xen

Shouldn't the ping reply appear on tap100 @ the host ?



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