On Sat, 27 Feb 2010, Simon Arlott wrote:

Packet capture attached. Is it possible to tell which side is at fault?
They are both responding to each other's ACK with another ACK at 400pps.

10:32:28.991111 IP6 2001:8b0:ffea:0:205:b4ff:fe12:530.35545 > 2001:500:b::1.53: . ack 766 win 58 <nop,nop,timestamp 2411331059 251057709>
10:32:28.995046 IP6 2001:500:b::1.53 > 2001:8b0:ffea:0:205:b4ff:fe12:530.35545: . ack 1 win 1559

Why only a single ends talks with timestamps?!?!?

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 i.