[153253] in North American Network Operators' Group
Re: IPv6 day and tunnels
daemon@ATHENA.MIT.EDU (Jeroen Massar)
Mon Jun 4 00:54:59 2012
In-Reply-To: <CAAAwwbX2=2qkYyY0yHZwZrGkS59EYAmGu5xhdRBtG41OxvQ6pA@mail.gmail.com>
From: Jeroen Massar <jeroen@unfix.org>
Date: Sun, 3 Jun 2012 21:54:12 -0700
To: Jimmy Hess <mysidia@gmail.com>
Cc: North American Networking and Offtopic Gripes List <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 3 Jun 2012, at 20:40, Jimmy Hess <mysidia@gmail.com> wrote:
> On 6/3/12, Cameron Byrne <cb.list6@gmail.com> wrote:
>> On Sun, Jun 3, 2012 at 6:38 PM, Joe Maimon <jmaimon@ttec.com> wrote:
> [snip]
>> #5 According to the IETF, MSS hacks do not exist and neither do MTU
>> issues http://www.ietf.org/mail-archive/web/v6ops/current/msg12933.html
>=20
> They couldn't be more wrong. MTU issues still exist, and not just
> with tunnelling,
> but tunneling should be an expected scenario for IP.
>=20
> The protocol IPv6 still handles it very poorly, by still requiring
> external ICMP messages,
> through the unreliable PTMUD scheme, matters are as bad if not worse
> than with IPv4.
As ICMPv6 is an integral part of IPv6 how exactly is ICMP "external"?
You do realize what the function of ICMP is I hope?
If one is so stupid to just block ICMP then one should also accept that one l=
oses functionality.
If the people in the IETF would have decided to inline the headers that are I=
CMPv6 into the IPv6 header then there for sure would have been people who wo=
uld have blocked the equivalent of PacketTooBig in there too. As long as peo=
ple can block stuff they will block stuff that they should not have blocked,=
nothing the IETF can do about, stupidity exists behind the keyboard.
That said, pMTU discovery works awesomely in the 10+ years that I have been a=
ctively been using IPv6, if it does no work for you, find the issue and reso=
lve it. (tracepath is a great tool for this btw)
> It's just so unfortunate that IPv6 couldn't provide a good solution
> to one of IP's more troublesome deficiencies.
Did you ever bother to comment about your supposed issue in the IETF?
Greets,
Jeroen
