Sat, 21 Feb 87 07:16:50 EST
Oh, I forgot to mention another problem which I first noticed last weekend.
We are unable to send segments to SRI-NIC.ARPA of size MTU. This time
NIC is the only host with which I have observed the problem. If I kludge
our tcp to negotiate a slightly smaller MSS, everything works fine.
On this end, we appear to be getting RFMNs from the long packet, but
NIC evidently isn't seeing it. The connection stays alive: we
retransmit the long packet, and they retransmit the previous ack.
This is not the standard 4.2/4.3 driver bug of not allocating buffers
at least one greater than MTU. That was fixed long ago. But the
symptoms are exactly the same. This is a NEW problem, and we haven't
changed any tcp/ip code here recently.
Evidently we can RECEIVE mtu-sized packets from the NIC.
--Bruce Nemnich, Thinking Machines Corporation, Cambridge, MA
email@example.com, seismo!think!bruce, firstname.lastname@example.org; +1 617 876 1111
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