Hello!
> Yes. The 5.6.7.8 machine is connected to the Internet via a Linksys
> "router" that is also performing masquerade.
>
> I will be very angry if this turns out to be the culprit.
I am afraid it is. It corrupts packets preserving their checksum.
Look:
> Trace taken from 1.2.3.4 machine
...
> 20:29:35.179648 1.2.3.4.379 > 5.6.7.8.1053: P 16468:16528(60) ack 65211 win 31856
><nop,nop,timestamp 3397515 1679644> (DF)
and
> Trace taken from 5.6.7.8 (aka 192.168.1.102) machine
...
> 19:18:26.808820 < 1.2.3.4.379 > 192.168.1.102.1053: P 16468:16528(60) ack 65211 win
>31856 <nop,nop,timestamp 3643345 3395672641> (DF)
5.6.7.8 received packet with garbage in timestamp area:
<3643345 3395672641> instead of <3397515 1679644>
And checksum is "corrupted" so that it remains right,
which is impossible to make occasionally.
Alexey
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