> On 14 Oct 2016, at 12:32, Gert Doering <[email protected]> wrote: > > Hi, > > On Fri, Oct 14, 2016 at 12:00:04PM +0200, Holger Zuleger wrote: >> Of course the default route should *not* be withdrawn. >> The RA default router announcement says just, "Hey hosts, I'm the way >> out of your local subnet", and not "Hey host, I have a upstream >> connection to the rest of the internet". > > If the router has no default route, it should not announce one - this > is why PIO exists for more specific info. > > Imagine a setup with *two* routers. One of them has broken Internet, > the other is working. How can the hosts decide if both keep announcing > themselves as "I can reach anything"?
in the general case the host still has to take the 'I can reach anything' announcement with a pinch of salt. and it should be able to try both (or more) connections and react accordingly when one fails. the first hop router has a very limited view of the end to end path. cheers, Ole
