It took me a couple of weeks to find a solution to this problem. In my case, I had a static PPP connection and was brining on a DSL connection to the internet. I wanted to have both active for some cut over period. To make this work, you need to use source routing. With this, it works like a charm. So, for a concrete example: eth0 is 99.99.99.99 router 99.99.99.100 eth1 is 199.199.199.199 router 199.199.199.200 My default route is set to 99.99.99.100 Install iproute2 Edit /etc/iproute2/rt_tables and add a line like "200 other" ip rule add from 199.199.199.199 lookup other ip route add default via 199.199.199.200 table other That's all it takes. A rule now exists to send out through eth1 any packets that originate from 199.199.199.199 which is what any connection to that interface will have for a response ip address. -rwd At 10:18 AM 10/19/00 -0400, technews@egsx.com wrote: >Hi, > >I would like to know if a Linux box with two ethermet cards eth0 and eth1 >can handle the following routing requierments. > >If traffic is received via eth0 the packets are routed back throught eth0 >and if traffic is received through eth1 the packets are routed back >through eth1. > >Each ethernet card has its own IP and are connected to different routers >that are connected to the net. Can this be done with static routing? or >is there something that has to be installed to do that since the default >gateway will always force teh traffic to go over eth0. > >Thanks in advance >Adonis > > > > >- >: send the line "unsubscribe linux-net" in >the body of a message to majordomo@vger.kernel.org Randall W Dean Director, System Software Mercury Computer Systems 199 Riverneck Road Chelmsford, MA 01824 (978) 256 0052 x1493 FAX: (978) 256 5205 - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org
