CentOS - Aug 2012 - default gateway outside of the LAN

Hello all,

We have a somewhat unique setup whereby our default router is outside of
the local network.

Let us say our network is 192.168.10.0/255.255.255.0

So we have a route-eth0 file that looks something like this:

10.1.1.1 via 192.168.10.1 dev eth0
default 10.1.1.1 dev eth0

The last definition would simply not take - but it has to for the setup to
work. And no, 192.168.10.1 does not operate as a full-fledge router due to
our setup.

When we attempt to add it manually we get the following error:

RTNETLINK answers: No such process

When we use ifup we get the following:

Error: either "to" is a duplicate, or "10.1.1.1" is a
garbage.

A little discussion of this can be found here:

http://www.centos.org/docs/5/html/5.1/Deployment_Guide/s1-networkscripts-static-routes.html

and here:

http://www.linuxquestions.org/questions/linux-networking-3/etc-init-d-networking-restart-errors-637610/

It does not help us, however. Any tips much appreciated.

Cheers,

Boris.

> 10.1.1.1 via 192.168.10.1 dev eth0
> default 10.1.1.1 dev eth0
>
You need to revisit your networking knowledge ... specifically what a
gateway is...

You need a router (gateway) on 192.168.10.0/24 (presumably 192.168.10.1 in
your example). On this you have a default route to the next hop of
10.1.1.1...

In terms of routing systems on 192.168.10.0/24 have no knowledge of
10.1.1.1 and no ability to influence the route other than the next hop on
the same local link network as them (192.168.10.1 in this example).

Hi Boris,
> We have a somewhat unique setup whereby our default router is outside of
> the local network.
'unique' is a very mild expression. The word you're actually looking
for was probably 'wrong'.

Your gateway *must* be in the network your interfaces are in. You also would not
want your living room be built without any doors and a sign on the wall 'the
exit is in the kitchen'.

Best regards, 

  Peter.