Hi, I've done some work on this a few month ago at my other job, and basically the solution lies in iproute2 commands. First you need to create a rule and assign that traffic to a different table than the main table. Then you can easily add a default route to that new table. so it would look like this ip rule add from 192.168.1.0/24 table X check /etc/iproute2/rt_tables if you want to make aliases like eth1 eth2 eth3 it will get easier if you automate this thing :) After that you set a default route to this new table. ip route add default via 1.2.3.4 table X Once you have this done and working it's a matter of getting your dhclient of pppoe to do this for you as soon as ip changes. for pppoe create a /etc/ppp/ip-up.local script. for dhclient stuff you need to look in /sbin/dhclient-script script to find out how it will execute what's in /etc/dhclient-enter-hooks or /etc/dhclient-exit-hooks It's quite useful and for me it did turn out to work nicely. I just had to create some sort of master script that would take decisions on what's going on with my gateways :) It was pretty fun to work on that. I hope this helps you out. Later, Charles On 5/26/06, Feizhou <feizhou at graffiti.net> wrote: > > Tom Brown wrote: > > Hi > > > > On a multihomed box how can i set different gateways for each NIC? > > Setting them in the ifcfg-ethx does not seem to make any difference to > > the routing? > > > > thanks > > _______________________________________________ > > CentOS mailing list > > CentOS at centos.org > > http://lists.centos.org/mailman/listinfo/centos > > Try creating routing tables per NIC, populating those tables and > creating ip rules to lookup the respective table. This means you need to > identify which NIC the packets belong to. You can try adding rules to > the mangle PREROUTING chain of netfilter to mark the packets based on > their source ip. Then the ip rules can instruct the kernel to lookup the > proper routing table depending on the firewall mark. > > man ip, man iptables, http://linux-ip.net/html/routing-tables.html and > http://linux-ip.net/html/tools-ip-route.html > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > -- Thx Joshua Gimer -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20060526/3e85587a/attachment-0005.html>