>What most people do of course is VRRP. Sure, or HSRP or GLBP ... all still doable.
> >Barring that, you just specify multiple default routers, and the client will >select the router that still responds to ARP. But support for this is not >universal, so. Indeed, not universal and in fact default behaviors vary wildly. > >When that isn't available, what I have done in the past here is to use the >DHCP server to give out a default router option that is sorted according to >the DHCP relay agent that was used to reach the server (keyed on giaddr >contents). > >The net result is that the client uses the default gateway which it used to >reach the DHCP server, and so will automatically receive an updated value if >that router fails, as part of DHCP lease rebinding (it will reach the server >via the alternate router). Which I think is pretty slick. OOC - between the "router fails" and "I renew/rebind my address", is the host down and out? So you are accepting either a noticeable outage or tweaking your lease times, yes?