Failover IPv6 with multiple PA prefixes (Was: IPv6 fc00::/7 - Unique local addresses)

Tim Franklin tim at
Mon Nov 1 05:24:31 CDT 2010

> Surely your not saying "we ought to make getting PI easy, easy enough
> that the other options just don't make sense" so that all residential
> users get PI so that if their ISP disappears their network doesn't
> break?

I've seen this last point come up a few times, and I really don't get it.

If you're multihomed with multiple PA GUAs, yes, you'd want each RA to track its corresponding WAN availability so your devices are using a prefix that has connectivity.

If you're a single-homed leaf network, why on earth wouldn't you want to generate RAs for your statically-assigned prefix all the time, regardless of the state of your WAN connection?


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