[LARTC] Two upstream gateways, only use one unless it fails?

[Kevin White]

I'm looking at setting up a system with two upstream Internet routers,
the second to be used only if the first fails.

There's a lot of information on using Julian's patches (the nano
document), and I'm still digesting all of it.  It looks pretty slick,
and I think it will work...but I don't see if I can actually set up
multipath and have the kernel not use the second interface unless it has
to.  It looks like I can only set weight and set up a percentage rule.

Am I missing something?  Can I say "here are two routes, always use
route one unless you can't?"

Thanks,

Kevin