> AFAIK yahoo uses FreeBSD boxes. FreeBSD implements T/TCP as standard so
> it could be related to some T/TCP breakage (it original T/TCP code that
> they incorporated is known to have a few bugs)
>
> I'm seeing the same problem with yahoo BTW.
>
> Is it worth asking tcp-impl?
Actually, it is bug in our tcp.
tcp specs section "segment arrives", subsection "SYN_SENT",
the last clause unambigously states that bare ack ISS<SEG.ACK<=SND.NXT
in state syn_sent must be silently dropped.
Certainly, it does not forgive yahoo. 8)
T/TCP does not contain anything looking like sending useless bare acks.
Alexey
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