Holger, >>> 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. > ...which is the default host behaviour if the OS supports RFC4861. > Sadly some "user friendly" network mangers breaks this and setting a > static route with a better metric to just one(!) router.
not really. that only covers the first hop. any failure anywhere else along the path would not be dealt with by 4861. cheers, Ole
