[99590] in North American Network Operators' Group
Access to the IPv4 net for IPv6-only systems, was: Re: WG Action: Conclusion of IP Version 6 (ipv6)
daemon@ATHENA.MIT.EDU (Iljitsch van Beijnum)
Fri Sep 28 17:18:37 2007
In-Reply-To: <46FC8227.4010406@piuha.net>
Cc: Alain Durand <alain_durand@cable.comcast.com>, Randy Bush <randy@psg.com>,
nanog@nanog.org
From: Iljitsch van Beijnum <iljitsch@muada.com>
Date: Fri, 28 Sep 2007 22:39:26 +0200
To: Jari Arkko <jari.arkko@piuha.net>
Errors-To: owner-nanog@merit.edu
On 28-sep-2007, at 6:25, Jari Arkko wrote:
>> And make it works both way, v4 to v6 and v6 to v4.
>> And also don=92t call it NAT-PT. That name is dead.
> For what it is worth, this is one of the things that I want
> to do. I don't want to give you an impression that NAT-PT++
> will solve all the IPv6 transition issues; I suspect dual stack
> is a better answer. But nevertheless, the IETF needs to
> produce a revised spec for the translation case. Fred and
> I are organizing an effort to do this.
The problem with NAT-PT (translating between IPv6 and IPv4 similar to =20=
IPv4 NAT) was that it basically introduces all the NAT ugliness that =20
we know in IPv4 into the IPv6 world. Rather than "solving" this issue =20=
by trying harder, I would like to take the IETF to adopt the =20
following approach:
1. for IPv6-only hosts with modest needs: use an HTTPS proxy to relay =20=
TCP connections
2. for hosts that are connected to IPv6-only networks but with needs =20
that can't be met by 1., obtain real IPv6 connectivity tunneled on-=20
demand over IPv6
The advantage of 1. is that proxies and applications that can use =20
proxies are already in wide use. The advantage of 2. is that it =20
provides real IPv4 connectivity without compromises. Different hosts =20
(even on the same subnet) can have different IPv4 connectivity (NAT/=20
no NAT, firewalled/unfirewalled) without having to provision the =20
complete path between the user and the edge of the network =20
specifically for that type of connectivity. And no lost addresses for =20=
subnetting etc.=
