brian@prism.UUCP (08/06/87)
After our upgrade to Osx 4.0, we found a similar problem -- our two
pyramids could talk to each other flawlessly (well...) but none of the
other computers on the net (mostly pc's) could access our 98x. It turned
out that the /etc/gateways file was configured IDENTICALLY on each of
the pyramids, and that the 98x thought that to reply to the PC's requesting
telnets, it had to go through our other host. The localloop would fail
to find a way to get to the net since it was more than a hop away, and
an ICMP : net unreachable would result. The transactions would appear like:
sender packet receiver
pc-telnet connx req (SYN) 98x-addr
98x-addr connx ack pc-telnet
locloop-98x ICMP:NET UNREACHABLE pc-telnet
By the way, pc's running mit-derived tcp/ip netstat are helpful for debugging
this sort of thing (and you don't want to call in the heavies with the net
analyzers).
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Brian K. Moran brian@mirror.TMC.COM
{mit-eddie, ihnp4!inmet, wjh12, cca, datacube}!mirror!brian
Mirror Systems 2067 Massachusetts Avenue Cambridge, MA, 02140
Telephone: 617-661-0777 extension 141
"Won't somebody tell me, just who and what I did...
Why's this ring on my finger, and who's that screaming kid? "
From "Lost Weekend" by the Beat Farmers
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