Re: [v6ops] A common problem with SLAAC in "renumbering" scenarios

[Philip Homburg <[e-mail]>]

>So given that document is 12 years old, with that default copied from one that
> is 21 years old, is an update required?  
>
>And if so, to what?

I think this should be updated.

A long time ago, the model was that you would get a prefix from your ISP
and that was the only global prefix on the local network.

So with short lifetimes, if the internet connection would go down for a 
relatively long period, there would be no global prefix anymore and hosts
would have to resort to link local to communicate (which obviously fails
if there are multiple subnets).

Some time in the past, the thinking changed and now there should be a ULA
prefix in addition to any global prefixes.

So I think that with a ULA, it makes more sense for a CPE to limit lifetimes
to some multiple of the RA interval.