[4524] in linux-net channel archive
Subnetting troubles on linux 2.0.20
daemon@ATHENA.MIT.EDU (Janice McCarthy)
Tue Sep 24 19:18:29 1996
Date: Tue, 24 Sep 1996 12:02:19 -0400 (EDT)
From: Janice McCarthy <janice@acpub.duke.edu>
To: linux-net@vger.rutgers.edu
Hi all,
I having trouble setting up a subnet under linux, and I was wondering if
anyone out there could offer some assistance.
Here is my setup:
I have 24 Multi UDB's running linux version 2.0.20.
8 machines have 100 Mb ethernet intalled in the PCI expansion slot
(all machines have an on-board 10Mb Ethernet as well).
1 of the above mentioned 8 machines is a firewall, so all others are
configured as class C private (IP = 172.16.1.blah).
Another of the above mentioned is (hopefully) configured as a gateway
to another subnet (of 7 more machines. these seven have only one
ethernet - the on-board 10Mb The addresses here are 172.16.2.blah).
Here is the problem:
I want to add a route to the 172.16.2.0 network from a machine on
the 172.16.1.0 network. I type:
route add -net 172.16.2.0 gw 172.16.1.3 dev eth1
(eth1 is the 100Mb adapter)
I get the following error:
SIOCADDRT: Invalid Argument.
Now, If I omit the -net option, route takes it, no problem, but
the route is added as a host route! What am I doing wrong??? I have
read the section on gateways and subnets in Olaf Kirch's book more times
than I care to count.
Another thing: If I add a default route, ie.
route add default gw 172.16.2.3 dev eth1
I can communicate across the gateway just fine. But then if I
ping between any of the machines on the same subnet - I get DUP! errors.
That is, if I ping between any two machines which are NOT the gateway, or
on opposite sides of the gateway, I get dups. Pinging to the gateway, or
across the gateway never produces duplicates!
HELP!!!!
Janice McCarthy
janice@acpub.duke.edu
