[Int-area] Re: NDP for RFC4291 Sec. 2.5.5.1. IPv4- Compatible IPv6 Addresses for v4-w-v6-nh Forwarding/RFC8950 at RS

Moin,
> V4-via-v6 uses NDP.  Actually, the main difference between ordinary
> IPv4 next-hop routing and v4-via-v6 is that the latter uses NDP where
> the former uses ARP.

Yes, because the nexthop is a v6 nexthop, so things are easy. ;-)

> V4-via-v6 aims at solving the problem of forwarding an IPv4 packet to
> a next hop with no IPv4 address.  In the case you describe above, it
> looks like the next hop does have an IPv4 address, so apparently
> you're solving a different problem.
> 
> Could you please describe the problem you're solving?

A host that 'usually' only does v4-w-v6 nexthop and does _not_ have
a(ny) v4 addresses getting routes with a v4 nexthop that are on a link
on which the host also is (but only has a v6 address on).

This occurs, for example, if you have an RFC8950 session to a route-
server at an IX and the route-server also sends you v4 routes with a
_v4_ nexthop.

With best regards,
Tobias


-- 
Dr.-Ing. Tobias Fiebig
T +31 616 80 98 99
M [email protected]
Pronouns: he/him/his

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