We have a web server which can be accessed via two different internet connections. So far the secondary connection has been using NAT on the firewall in order since the default gateway in the web server points to the primary connection. However, when using NAT you miss all web statistics.

So, I decided to find out whether it is possible to use multiple default gateways in Linux. The approach would be to use 2 different virtual IP addresses on the box and have different default gateways depending on which virtual IP is accessed.

This turned out to be very easy indeed using iptables.

The box is running RedHat 9 using iptables 1.2.7a.

All needed was this:

This entry was posted on Tuesday, August 15th, 2006 at 10:35 and is filed under Linux. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.