2015-03-27 13:40 GMT-03:00 rizz2pro . <rizzz2...@gmail.com>: > Hey, thanks for replying. > > It doesn't seem to work with any number at all actually. > > If I didn't have multipathing enabled, these work: > > $ route change default -priority 1 > $ route change default -priority 15 > $ route change default -priority 6 > > But having multipath setup, it seems like it doesn't know which route to > change or how to handle it: > > $ route change -mpath default 64.4.4.4 -priority 1 > $ route change -mpath default 64.4.4.4 -priority 6 > $ route change -mpath default 64.4.4.4 -priority 15 > > # route: writing to routing socket: No such process > # change net default: gateway 64.4.4.4: not in table > > I guess normally you don't need to specify the gateway in the command > without multipath because there is only one gateway. But I need to be > specific. > > If I try > > $ sudo route change -mpath default -priority 7 > > Then it lets the system choose which route to change and I get very mixed > results (sometimes one interface gets the priority..and sometimes the other > one!) > > I might be wrong, but if you might know of a way to do it, I would > appreciate any hints. Hope it's not a bug? > > Thanks for the help, > > RZ > > > On Thu, Mar 26, 2015 at 6:24 PM, Martin Pieuchot <m...@openbsd.org> wrote: > >> On 26/03/15(Thu) 14:07, rizz2pro . wrote: >> > Hello everyone, >> > >> > I hope I posted this in the right area, I don't usually join mailing >> lists >> > so I am still a bit of a noob. >> > >> > Anyways, hoping someone could help me out. I am coming up empty on my >> > searches figuring this out. >> > >> > If I have 2 default gateways configured with priorities, how would I >> modify >> > the priorities using "route change"? I would prefer not to have to delete >> > the route and re-add them. >> > >> > $ sudo route add -mpath default 64.4.4.4 -priority 1 >> > $ sudo route add -mpath default 129.2.2.2 -priority 15 >> > $ sudo netstat -rn | grep default >> > ~ >> > # default 64.4.4.4 UGS 3 3308 - 1 em0 >> > # default 129.2.2.2 UGS 0 0 - 15 >> em1 >> > >> > If I try to change priorities: >> > >> > $ sudo route change -mpath default 129.2.2.2 -priority 1 >> > ~ >> > # route: writing to routing socket: No such process >> > # change net default: gateway 129.2.2.2: not in table >> > >> > Any hints as to how I can change priority on a default multipath route? I >> > would appreciate it greatly. >> >> Does it work with "-priority 2"? The number "1" is special and reserved >> for routes representing local (your own) addresses. I just realized >> that this is not (and should) be documented.
You got it right, you can't change a multipath route. It's a limitation of the kernel API and there's nothing you can do about it. I came across this problem too when I was working on ldpd(8): https://github.com/rwestphal/openbsd-ldpd/blob/renato-2015/kroute.c#L1344 If removing a route and re-adding it with a new nexthop poses a problem to you please let us know so we can think about a solution. PS: please don't top post on @misc. -- Renato Westphal
