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RE: Running code (Was: I-D Action: draft-ietf-6man-ipv6only-flag-03.txt)

"Manfredi (US), Albert E" <albert.e.manfredi@boeing.com> Fri, 26 October 2018 20:01 UTC

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From: "Manfredi (US), Albert E" <albert.e.manfredi@boeing.com>
To: Brian Haberman <brian@innovationslab.net>, "ipv6@ietf.org" <ipv6@ietf.org>
Subject: RE: Running code (Was: I-D Action: draft-ietf-6man-ipv6only-flag-03.txt)
Thread-Topic: Running code (Was: I-D Action: draft-ietf-6man-ipv6only-flag-03.txt)
Thread-Index: AQHUbJuG2Zjjso5+/km4+87SaUMNqaUwfHjwgAE2LoCAACLHMIAAkS2A//+MFAA=
Date: Fri, 26 Oct 2018 20:00:57 +0000
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-----Original Message-----
From: ipv6 <ipv6-bounces@ietf.org> On Behalf Of Brian Haberman

> WRT DNS... Are you referring to DNS answers that contain IPv4 addresses
(e.g., A records) or are you referring to DNS answers that arrive via
IPv4 transport? The latter appears to be a viable heuristic, the former
is not. The other aspect that we have to be careful of is the potential
deployment of DNS-over-HTTP(s), which adds a layer (or two) of indirection.

Brian, I was actually thinking about A records. However, your better idea works too.

So okay, even in the case of egregious indirection, because DNS is lying about IPv4 destinations, the host won't be able to use any IPv4 default router. So, only un-updated IPv4 hosts will insist on waiting and retrying forever, and only on networks without L2 filtering would this even be a problem.

Bert

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