Dâniel Fraga wrote: > I have 2 cable modems on a server (Linux 2.6.22). I use > multipath, so the route is something like this: > > default > nexthop via 201.6.102.1 dev eth1 weight 256 > nexthop via 201.6.107.1 dev eth2 weight 128 > > The first one (eth1) has a higher priority, then when it goes > down, I can mark the interface eth1 down and Linux automatically > detects the "dead" gateway and change the route to the second one. > > Ok. The problem is that when one of the modems goes down, and > as they use the cdc_ether module to communicate via USB, the *entire* > route is erased because one of the devices doesn't exist anymore. > > It's not a problem with hotplug, since it's correct to remove > the device and the route that would go through it. But it would be nice > if the kernel just removed the specific "nexthop" which uses the > inactive device instead of removing the entire default route. > > Is there a way to tell the kernel to do that? Or to not remove > the route at all and just mark the "nexthop" with the inactive device > as dead and wait for it to come back alive? Simple solution, use fallback routes: default nexthop via dev eth1 ... nexthop via dev eth2 ... default nexthop via dev eth1 .. default nexthop via dev eth2 .. Removing either interface will cause the multipath route and one of the other default routes to be removed and the remaining one can take over. - To unsubscribe from this list: send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
