On Wed, Oct 20, 2004 at 09:25:51AM -0400, Payal Rathod wrote: > Hi, > I have a question which has haunted me for many months. If I have 2 ISP > connections with me, with default gw 1.2.3.4 and 4.5.6.7 and if I add > both as default routes on my Linux gateway as, > route add -net default gw 1.2.3.4 > route add -net default gw 4.5.6.7 > and if I send a packet from a windows client to internet, which ISP will it > go through? this will sound like a stupid answer, but it will probably always use the route that you added first. the 'route' command will allow you to added multiple default routes, but the ones you add after the first one end up getting ignored. the 'ip' command won't let you add a default route once you have one (it uses teq and multipath for this): $ ip route list | grep default default via 10.2.1.1 dev eth0 $ sudo ip route add default via 10.2.1.2 RTNETLINK answers: File exists if you want to load-balance outbound traffic over multiple ISP links, you'll want to use something along the lines of the 'nth' patch from POM: http://netfilter.org/documentation/HOWTO/netfilter-extensions-HOWTO-3.html#ss3.9 if you want to split outbound traffic over multiple links by source IP or protocol, etc--you can use the concepts from: http://lartc.org/howto/lartc.netfilter.html -j -- Jason Opperisano <opie@xxxxxxxxxxx>
