[clug] A Routing problem
steve at namsys.com.au
Thu Oct 21 00:42:37 GMT 2004
Thanks for the assistance. I figured it would be possible somehow. I
can now apply that to my end of the system.
I need to find out if the "ip" command applies to the solaris box at the
other end of the link.
Thanks again for the help.
Rod Tunks wrote:
> thats no problem. You setup different routing tables based on source
> address/device. This way each interface can see a completely different
> set of routes. We have a router here with 6 ethernet interfaces of
> which 2 are feeds out of the building used for different purposes.
> Routing is done based on both source and dest addresses.
> Here's a quick cut and paste example :-
> # specify anything from 192.168.76.0/24 uses the new table called
> ip rule add from 192.168.76.0/24 table privateip
> #Set up the routes for this table.
> ip route add default via 192.168.99.1 dev eth5 table privateip
> ip route add 192.168.76.0/26 dev eth4 src 192.168.76.1 table privateip
> ip route add 192.168.76.208/28 via 192.168.0.2 dev eth2 table privateip
> ip route add 192.168.76.192/28 dev eth3 src 192.168.76.193 table
> <snip> and so on.
> You need to create the new table entry (ie 501) and optionally give it
> a name for each routing table you need. In your case three tables may
> be overkill but it gives you the most flexability if your networks are
> perpetually in a state of flux (like ours)
> We had some issues with arp due to our rather weird lan setup and
> found echo 1 > /proc/sys/net/ipv4/conf/all/arp_filter was needed as
> well. YMMV
> Very low end hardware will cope with this kind of set up no problems
> at all. Our 6 port box is a PIII with 4 x 100M lans and 2 x 2M+ feeds
> out of the building and doesnt raise a sweat. Gotta love linux routers!
> The linux advanced routing & traffic control howto covers this quite
> (from next door)
> This email may contain traces of nuts and/or caffeine
> Stephen Hodgman wrote:
>> I have a question regarding routing. I have a linux system with
>> three interfaces say eth0, eth1 & eth2
>> On eth0 is network 184.108.40.206/24 (say)
>> I want traffic entering eth1, destined for 220.127.116.11/24 to be
>> routed to eth0 - always
>> I want traffic entering from eth2 destined for 18.104.22.168/24 to be
>> routed to eth2 - always
>> The reason is that there is a route either way but I only want one
>> device to route directly.
>> Can this be done? It seems to require routing tables based on source
>> I would appreciate knowing how this can be done.
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steve at namsys.com.au
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