I am trying to set up failover default routes. The situation is three OpenBSD machines, client, rtr0 and rtr1. Client has two interfaces, one with a crossover link to rtr0 and one to rtr1. I would like the default route for client to be rtr0 unless rtr0 has failed in some way (unreachable, etc). As far as I know, I can not use carp to give a single default route ip carp'd between rtr0 and rtr1 because they are not on a shared network. I know this has been discussed before and have read some archived posts (including the recent "inet failover solution" thread) but still have questions. I have read about the following options but would like some guidance/advice (and of course any pointers to previous docs/posts): 1) ifstated with ping and if.up tests and executing route commands The idea here would be ifstated would trigger commands something like: route delete default rtr0.ip; route add default rtr1.ip
2) ifstated executing pf table change commands Same sort of tests, but instead of issuing route commands, change a pf table that is being used as a "route-to". I am not sure exactly what this would look like yet. I am not sure what this would look like yet, I am still reading more on route-to. Downsides to ifstated approach is that I would like to use ifstated to also control a different set of interfaces from client, so this may create a complex many-state ifstated.conf. 3) new multipath routing, but somehow disable one route This one confuses me a bit. I read the presentation about the new multipath routing and some associated docs and it seems that multipath routing can only be used for balancing across routes based on source. I really want to have a failover set up, NOT load balancing so I don't think this would work. 4) ospf, bgp I am aware of these routing daemons but really don't know too much about them. I read some docs and it seemed overly complex for setting up just a simple failover default route on internal machines. Thanks in advance, Chris
