> I am working on 2.6.26 kernel. I am trying to setup Policy based > routing with multiple IP addresses in same subnet, with multiple > routing tables, each having its own default gateway. I have no route > in the 'Main' table. Problem is that I am not able to add default > route in each of the routing table. > > I have 3 interfaces in the same subnet, sharing the gateway. I am Why are you trying to do this? It's not something that is normally done, and unless you have a really good reason, I think it's likely it's not really a very good idea. If you want them to share a gateway, then I would think you would simply provision each interface with a different subnet and then just create a single gateway. > using 3 different routing tables for them. I need to add this gateway > to each of the routing tables with different interface associated with > the routing table. > > Routing tables look like this - > > eth0: 192.168.1.1/16 > eth1: 192.168.1.2/16 > eth2: 192.168.1.3/16 > > main table: empty > > ---- eth0tbl: routing table for eth0 ---- > 192.168.0.0/16 dev eth0 > > --- eth1tbl: routing table for eth1 --- > 192.168.0.0/16 dev eth1 > > --- eth2tbl: routing table for eth2 --- > 192.168.0.0/16 dev eth2 > > #ip rule > 0: from all lookup local > 2: from 192.168.1.1 iif lo lookup eth0tbl > 3: from all to 192.168.1.1 iif eth0 lookup eth0tbl > 4: from 192.168.1.2 iif lo lookup eth1tbl > 5: from all to 192.168.1.2 iif eth1 lookup eth1tbl > 6: from 192.168.1.3 iif lo lookup eth2tbl > 7: from all to 192.168.1.3 iif eth2 lookup eth2tbl > 32766: from all lookup main ----------> /* empty */ > 32767: from all lookup default ----------> /* empty */ > > when I give following command to add default route, it returns error - > #ip route add default via 192.168.254.254 dev eth0 table eth0tbl > RTNETLINK answers: No such process. > > #ip route add default via 192.168.254.254 dev eth1 table eth1tbl > RTNETLINK answers: No such process. > > #ip route add default via 192.168.254.254 dev eth2 table eth2tbl > RTNETLINK answers: No such process. > > arp_announce, arp_ignore and arp_filter are all set to 1. > Is there a way this can be achieved? Is this available in any of the > later kernel versions? Any pointers would be of help. To the best of my knowledge, it can't be done. It doesn't even make a whole lot of sense to me. What are you trying to do? Some routers allow multiple paths to a single destination, but I don't think Linux does. Regardless, having three different LAN segments on the same subnet presents a number of very sticky issues. Why do you want three different segments on the same box to be on the same subnet? Why do you want three different default gateways? Are you trying to load balance your network or something? -- To unsubscribe from this list: send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
