[GROW] Re: [Int-area] NDP for RFC4291 Sec. 2.5.5 .1. IPv4-Compatible IPv6 Addresses for v4-w-v6-nh Forwarding/ RFC8950 at RS

Moin,
> You mean a router, right?  If a host has no IPv4 addresses assigned,
> then I don't see how it can send an IPv4 packet.

Actually; *on an interface.

one way to use v4-w-v6 nh in practice is binding the v4 address to lo
(granted, on routers, but this also holds for packets they originate);
Similarly, it makes--at least--sense for dual-homed hosts. Then again,
even with a v4 /32 bound to an external interface, you would need a
host route for, at least, the GW to make this work with ARP.

Otherwise, 


> And if it's a router, then I'd find it more natural to use ARP, with
> the undefined address in the ar$spa field.

That would require touching implementations to a similar degree, as
currently a host is unlikely to respond to an ARP packet from a non-
local ar$spa, no? And if that has to be done anyway, going for NDP
(i.e.: L3) would make more sense?

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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