Re: Link addressing

On 24/03/2014 23:26, Ole Troan wrote:
> Glen,
> 
>>> that seems like a misunderstanding. manual configuration of addresses has always been part of the IPv6 addressing architecture.
>> Hello Ole,
>>
>> It's not a statically addressed subnet, it's a EUI-64 autoconf subnet.
> 
> routers (as defined in RFC4861) don't autoconfigure addresses using SLAAC. that's a host function.
> a router may automatically create an EUI-64 based interface-id, but this is based on configuration, not on SLAAC.
> on an IPv6 link there are many ways of creating interface-identifiers. manually configured, EUI-64, random, etc. all of these can co-exist on a link.

I suspect that needs to be written in bold letters in many
places. Unfortunately the mandatory language of RFC 2464 has
often been interpreted as meaning more than was intended.

    Brian

>> Operationally it is extremely useful to select the router's address, overriding autoconf for that address whilst allowing other machines to autoconf as per usual. Autoconfing the router's address escalates a simple "remote hands card replacement" into "engineer to examine configuration and test operation of all IPv6 router features after card replacement" because of the possibility that the interface's address is mentioned in the router's configuration (ACLs, source address for protocols, etc).
> 
> yes, indeed. I configure most of my router interfaces with interface-id <prefix>::1.
> there is obviously nothing prohibiting that in the IPv6 addressing architecture, nor has anything around that changed, or dare I say will ever change.
> 
> cheers,
> Ole
> 
> 
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