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Re: [v6ops] NAT64 in RA, draft-ietf-6man-ra-pref64

"Mudric, Dusan (Dusan)" <dmudric@avaya.com> Wed, 03 July 2019 19:02 UTC

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From: "Mudric, Dusan (Dusan)" <dmudric@avaya.com>
To: 6man <6man@ietf.org>, IPv6 Operations <v6ops@ietf.org>
Thread-Topic: NAT64 in RA, draft-ietf-6man-ra-pref64
Thread-Index: AdUx0cT0aqZJH36KQ+aPddD1wR/aYA==
Date: Wed, 03 Jul 2019 19:01:51 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/v6ops/xSlsy2vkzCo9PdVtlGhD5W7x0Xk>
Subject: Re: [v6ops] NAT64 in RA, draft-ietf-6man-ra-pref64
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> 
> On Tue, Jul 2, 2019 at 9:49 AM Jen Linkova <furry13@gmail.com> wrote:
> 
> > I've been told that an IPv6-only
> > host might want to exclude some addresses from synthesis and use IPv4
> > to reach them, so I'm trying to understand how *an IPv6-only* host
> > (which, IMHO, can only use IPv6) reach anything using IPv4.
> >
> 
> Right. That was the gist of my earlier comment. I believe we all agree that
> in the most common deployment scenario (i.e., an IPv6-only host with no
> IPv4), an exclusion list is not useful, because the host really can't reach
> anything that's not reachable via IPv6.
> 

> From: v6ops <v6ops-bounces@ietf.org> On Behalf Of JORDI PALET
> MARTINEZ
>     And, oh yes, someone using IPv4 (or X.25, or SNA) could go through a
> translator and communicate with an IPv6-only host in such a domain. It's
> IPv6-only up to that translator.

[Dusan] Please clarify how IPv4-only host can reach IPv6 only host, and vice versa. Also, how IPv6 only host can know IPv4 address of IPv4 only host, assuming IPv4 only host is in a public domain?

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