On 2016-04-07, Doran Mori <dhm...@gmail.com> wrote: > Running 5.9. > > I have x.x.141.0/25 that's directly connected. With x.x.141.0/24 reachable > via bgp. > > # route -n get x.x.141.13 > route to: x.x.141.13 > destination: x.x.141.0 > mask: 255.255.255.128 > interface: em3 > if address: x.x.141.112 > priority: 4 (connected) > flags: <UP,DONE,CLONING> > > # ifconfig em3 down > jawaka# route -n get x.x.141.13 > route to: x.x.141.13 > destination: 66.117.141.0 > mask: 255.255.255.128 > interface: em3 > if address: x.x.141.112 > priority: 4 (connected) > flags: <DONE,CLONING> > > I see the UP flag is removed but it has no effect. > > # ping x.x.141.13 > PING x.x.141.13 (x.x.141.13): 56 data bytes > ping: sendto: Network is down > > I would expect this route to be used instead: > # route -n get x.x.141.0/24 > route to: x.x.141.0 > destination: x.x.141.0 > mask: 255.255.255.0 > gateway: x.x.144.154 > interface: em2 > if address: x.x.144.153 > priority: 48 (bgp) > flags: <UP,GATEWAY,DONE> > > I searched the archives but didn't see this specific case mentioned. Can > someone enlighten me?
That is how things normally work. Sometimes the behaviour you want would be useful (especially for machines that move between wired and wireless connectivity) but in other cases (e.g. the usual case with a bgp router) it would be undesirable as it would cause a routing loop, so there's no one-size-fits-all answer. I'm not sure if there is any way to manipulate the route entry to do what you want. If there is, it's non-obvious at least!
