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Re: [v6ops] A good example of why we need to careful about ULAs

Lorenzo Colitti <lorenzo@google.com> Sat, 01 June 2013 03:19 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Sat, 01 Jun 2013 12:19:16 +0900
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To: Ted Lemon <Ted.Lemon@nominum.com>
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Cc: "v6ops@ietf.org WG" <v6ops@ietf.org>, "draft-ietf-v6ops-ula-usage-recommendations@tools.ietf.org" <draft-ietf-v6ops-ula-usage-recommendations@tools.ietf.org>
Subject: Re: [v6ops] A good example of why we need to careful about ULAs
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On Fri, May 31, 2013 at 11:12 AM, Ted Lemon <Ted.Lemon@nominum.com> wrote:

> On May 30, 2013, at 6:07 PM, Jeroen Massar <jeroen@massar.ch> wrote:
> > If you know how to replicate it, I am very interested in a packet dump
> > or what is involved to cause it.
>
> Just number your internal network using ULAs and no global addresses, and
> then run a traceroute across it.   Global addresses on the source end,
> global addresses on the destination end, ULAs in the middle.   The only way
> to "fix" this is to break traceroute.   This does not represent brokenness.


RFC 4193 section 4.3 disagrees with you. It says that border routers should
drop those packets and send back ICMP unreachables.

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