I also would have expected more ACK's from the HP box. It's been a long
time since I did TCP, but I thought the rule was still that you were
supposed to ACK at least every other full frame - but the HP box is acking
roughly every 16K (and it's *not* always at TSO boundaries: the earlier
ACK's in the sequence are at 1460-byte packet boundaries, but it does seem
to end up getting into that pattern later on).
Drift...
The RFC's say "SHOULD" (emphasis theirs) rather than "MUST."
Both HP-UX and Solaris have rather robust ACK avoidance heuristics to cut-down
on the CPU overhead of bulk transfers. (That they both have them stems from
their being cousins, sharing a common TCP stack ancestor long ago - both of
course have been diverging since then).
rick jones
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