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On 02/02/2011 17:43, Matt Addison wrote:
> Why do they have to be mutually exclusive? What's wrong with having default
> well known (potentially anycasted) resolver addresses, which can then be
> overridden by RA/DHCP/static configuration?

because that increases the complexity of the system, and complexity leads 
to more failure modes.  If you model how this would work on a state 
diagram, you'll see that there are several inherent ways that this will 
cause serious problems when people start doing things like removing the 
well known addresses (because they don't use them), and so forth.

This is a well-examined problem: well known unicast listener addresses are 
a bad, bad idea.