Date: Wed, 28 Oct 1998 14:43:04 +0000 From: "Nick A. Fikouras" <nick@dcs.shef.ac.uk> To: "freebsd-questions@FreeBSD.ORG" <freebsd-questions@FreeBSD.ORG> Subject: 'Routing table' problem Message-ID: <36372D77.DD9EA638@dcs.shef.ac.uk>
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Hi,
I have three freebsd-2.2.2 machines with two ethernet cards each. Each
machines is connected with each other with an Ethernet link. All
interfaces have IP addresses that belong to the same subnet (say:
255.255.252.0).
The task is: when machine A is having a connection with machine B then
traffic from AtoB should use their direct route while traffic from BtoA
should use the route with the intermediate router C.
A
ep1/ \ep0
/ \
vx0/vx1 vx1\ vx0
B ------- C
Now, the problem is: when I boot up cleanly, A and C can "see" each
other. I know because they can ping each other. It is noted that A and C
are inteconnected through their link#1 (ep0 and vx0). Machines A and B
or B and C can not see each other so I add a route from B to A and one
from A to B:
In machine B:
route add -host A -interface vx0
In machine A:
route add -host B -interface ep1
with netstat -r I can see that a route has been established to the
corresponding host but under GATEWAY I find the ethernet address of the
interface that was entered as a parameter to the 'route add' command and
not that of the destination node.
Now, the funny part comes. When A pings B, I can observe with TCPdump
that ping requests are received at interface vx0 of node B but it does
not make any replies. This event is observed when either of the machines
(B or A) is initiating the ping.
It looks as if it is a simple routing table problem, but I haven't been
able to get through it for the greatest part of three days.
I would appreciate any comment,
thanks in advance,
nick
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