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Re: 6to4 using ::FFFF:0000:0000/96

To: Kevin Day <toasty@dragondata.com>
Subject: Re: 6to4 using ::FFFF:0000:0000/96
From: Florian Weimer <fw@deneb.enyo.de>
Date: Mon, 28 Jan 2008 10:55:22 +0100
Cc: Brian E Carpenter <brian.e.carpenter@gmail.com>, v6ops <v6ops@ops.ietf.org>
In-reply-to: <CA92E055-A25B-4AD7-860A-9B8915A15300@dragondata.com> (Kevin Day's message of "Sun, 27 Jan 2008 22:45:50 -0600")
References: <1960684A-584F-4754-A122-0940BC61DDC0@dragondata.com> <67099930801231003l648d3200k7c86be48d35b21ef@mail.gmail.com> <479CD34E.7010403@free.fr> <A3B8A0B7-7E54-4A88-8C07-29DD2CBE727E@dragondata.com> <479CF498.4090702@gmail.com> <88AA9D9F-603D-428A-8C05-1A41D56DFE80@dragondata.com> <479D51EB.5050707@gmail.com> <CA92E055-A25B-4AD7-860A-9B8915A15300@dragondata.com>

* Kevin Day:

> I will say that this seems to be impossible for someone running a
> relay on any of the BSDs(Free/Net/Open/Dragonfly), or OS X.  They will
> not accept or route any mapped(::FFFF:0:0/96) addresses at any time,
> so it's not possible without removing some code from in_input.c to
> even forward packets to a NAT-PT box.

And thanks to BCP38 filters, you actually need to run some kind of NAT,
which means that the gateway is no longer stateless.  Maybe this
wouldn't be a problem, but I fear that it doesn't really help to improve
reliability of that service.

References:
- 6to4 using ::FFFF:0000:0000/96 (mail.comcast.net AAAA record weirdness)
  - From: Kevin Day <toasty@dragondata.com>
- Re: 6to4 using ::FFFF:0000:0000/96 (mail.comcast.net AAAA record weirdness)
  - From: "Erik Kline" <ekline@ekline.com>
- Re: 6to4 using ::FFFF:0000:0000/96 (mail.comcast.net AAAA record weirdness)
  - From: Kevin Day <toasty@dragondata.com>
- Re: 6to4 using ::FFFF:0000:0000/96 (mail.comcast.net AAAA record weirdness)
  - From: Brian E Carpenter <brian.e.carpenter@gmail.com>
- Re: 6to4 using ::FFFF:0000:0000/96 (mail.comcast.net AAAA record weirdness)
  - From: Kevin Day <toasty@dragondata.com>
- Re: 6to4 using ::FFFF:0000:0000/96 (mail.comcast.net AAAA record weirdness)
  - From: Brian E Carpenter <brian.e.carpenter@gmail.com>
- Re: 6to4 using ::FFFF:0000:0000/96
  - From: Kevin Day <toasty@dragondata.com>

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