global/link-local nexthops and RFC2461

[Pekka Savola <pekkas@xxxxxxxxxx>]

Hi,

Discussing one implementation, a possible source of ambiguity in RFC2461 
came up.

RFC2461 discusses that next-hops must be on-link.

However, section 8 on redirect basically requires:
 - routers know each others' link-local addresses (not an issue from 
hosts' perspective, just use routing protocols or other mechanisms)
 - hosts are able to verify that the redirect comes from the link-local 
address the host is currently using as its next-hop

The latter is a bit problematic.  How could the host know this in the case 
where the next-hop has been configured using e.g. a _global_ (but on-link) 
address?

What's the deal here?

-- 
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings

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