>> 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.
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