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?
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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