Re: IPv6 only host NAT64 requirements?

Mikael Abrahamsson <> Tue, 21 November 2017 06:16 UTC

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Date: Tue, 21 Nov 2017 07:16:49 +0100 (CET)
From: Mikael Abrahamsson <>
To: Ole Troan <>
cc: Brian E Carpenter <>, 6man WG <>
Subject: Re: IPv6 only host NAT64 requirements?
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On Mon, 20 Nov 2017, Ole Troan wrote:

> Brian,
>> One thing that we demonstrated very convincingly last week
>> is that there are enough legacy devices and applications in
>> existing user hosts that the co-existence plan is still needed.
>> (And, BTW, we demonstated it for user hosts belonging to
>> relatively sophisticated users.)
> Huh?
> Data please.

Oh, come on.

For me:

Mosh didn't work (it's single stack once it's connected)
Steam doesn't work (even on Win10). I have no idea how many games do not 
work (because I can't start them), but I'd bet it's A LOT.
Nothing on my corporate VM works (because Parallels does IPv4 NAT, and 
needs to be explicitly configured to be bridged to some NIC/wifi to even 
get the RS on the outside). My VPN doesn't work even if I bridge. Software 
update on Win7 doesn't work on IPv6 only.

These are just things I myself discovered. Yes, getting the VPNs working 
might be a good step (because they'd now be v4aaS) but saying 
v6-only+NAT64 or something, is a viable option in the near future for 
99.9% of users, that's just being silly.

Yes, Jen probably can do it because her employer uses Chrome as its main 
tool for getting anything done. Personally I have in the neighborhood of a 
hundred applications running on my Mac. If I had a windows 7 machine 
as my only environemnt (because enterprise), things would be even worse.

The mass of installed things on devices that need ipv4 literals to work is 
staggering, especially in the long tail. So without bump-in-the-API or 
CLAT, this just won't work in the next 10 years.

Mikael Abrahamsson    email: