Hi,
* On Tue, Aug 28, 2001 at 06:11 PM (-0300), Eduardo wrote:
> I have a router with two interfaces, each one to a different carrier. At
> the router, my default gateway is to carrier #1. Well, the router is
> connected directly to a Linux firewall box and I need, depending on the
> source information of a packet, to route the packet to carrier #2.
>
> I think that I can use the 'ip rule' and 'ip route' commands. As the
> firewall default gateway is the router box, I think that I could set the
> 'nexthop' parameter at the 'ip route' command to do the correct output
> interface routing when the packet arrives the router, using a command
> like this:
>
> ip route add default via *router-ip* nexthop via *router-device-2-ip*
>
> But I get the following error:
>
> *RTNETLINK answers: Invalid argument*
>
> What this could be?
If you want to do a kind of load balancing based on equal cost multipath
you can try the "ip route" and "nexthop". But therefore the command line
should look like:
ip route add default \
nexthop via *gateway-ip-1* dev *device-1* \
nexthop via *gateway-ip-2* dev *device-2*
So IMHO you'll need two "nexthop" statements.
But I don't think that you really want to do equal cost multipath),
you'll rather need policy routing based on the packet's source address.
<untested>
So I think you should set up different routing tables and each table has
its own default gateway string, i.e. something like this:
ip route add default via *gateway-ip-1* dev *device-1* table 100
ip route add default via *gateway-ip-2* dev *device-2* table 200
Then you will need "ip rule" commands which specifies the table each
packet has to use, e.g.:
ip rule add from <source-address-1> table 100
ip rule add from <source-address-2> table 100
.
.
.
ip rule add from <source-address-10> table 200
ip rule add from <source-address-11> table 200
</untested>
> Thanks,
I hope that I could help you!
Bye,
Steffen
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