Re: NOTE: WG Last Call: draft-ietf-v6ops-mech-v2-01.txt

[Erik Nordmark <Erik.Nordmark@sun.com>]

> Note: the document should be clearer that configured tunnels are typically 
> point-to-point, and then you typically don't even need the link-local 
> addresses, so this becomes practically rather irrelevant..

There are some cases when link-locals would be required. For instance,
for a host-router tunnel it might make sense for the router to send router
advertisements and those must be sourced with link-local addresses.

For a router-router tunnel I think the link-locals can be omitted, unless they
are used as next-hops across the tunnel.

Given this we need to specify one way to pick link-local addresses by default
for configured tunnels so that the two ends don't pick the same address.
Either using the IPv4 address (with "local") or an EUI-64 derived address
(with "local" not set) would work.

   Erik