[10617] in Hotline Meeting
ZBT Gateway problem
daemon@ATHENA.MIT.EDU (Patrick J. LoPresti)
Mon Sep 14 01:24:25 1992
Date: Mon, 14 Sep 92 01:24:02 -0400
From: Patrick J. LoPresti <patl@golem.MIT.EDU>
To: hotline@Athena.MIT.EDU
There is a strange problem with the new ZBT gateway machine
(zbt-gw.mit.edu). From machines here at ZBT, we can ping athena.
From machines at LCS, we can ping athena. But we cannot ping
machines at ZBT from LCS or vice-versa.
Example from here:
golem> /etc/ping lcs.mit.edu
PING lcs.mit.edu: 56 data bytes
^C
----lcs.mit.edu PING Statistics----
14 packets transmitted, 0 packets received, 100% packet loss
golem>
A somewhat more interesting example:
golem> traceroute lcs.mit.edu
traceroute to lcs.mit.edu (18.26.0.36), 30 hops max, 38 byte packets
1 ZBT-GW.MIT.EDU (18.143.0.1) 21 ms 15 ms 13 ms
2 ZBT-GW.MIT.EDU (18.143.0.1) 15 ms !H * 13 ms !H
golem>
The man page says that "!H" means that a "host unreachable" reply
came back from the gateway.
This problem only seems to happen with LCS machines. We can reach
other MIT subnets, and the rest of the world, just fine (as far as I
can tell).
-Pat
