[134552] in North American Network Operators' Group
Re: Problems with removing NAT from a network
daemon@ATHENA.MIT.EDU (Matthew Kaufman)
Thu Jan 6 21:55:26 2011
Date: Thu, 06 Jan 2011 18:55:19 -0800
From: Matthew Kaufman <matthew@matthew.at>
To: Owen DeLong <owen@delong.com>
In-Reply-To: <9DEED87C-ED15-4D05-BCD6-69A5D4A69681@delong.com>
Cc: Nanog Operators' Group <nanog@nanog.org>
Reply-To: matthew@matthew.at
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 1/6/2011 5:48 PM, Owen DeLong wrote:
> Doesn't all of this become moot if Skype just develops a dual-stack capable client
> and servers?
>
Not really. Imagine the case where you're on IPv6 and you can only reach
IPv4 via a NAT64, and there's no progress made on the detection problem.
And your family member is on a Skype-enabled TV plugged into an
IPv4-only ISP.
Now you can't get a direct media path between you, even though their ISP
is giving them IPv4 and your ISP is *claiming* you can "still reach the
IPv4 Internet".
Skype can still make this work by relaying, but in order to protect the
relay machine's bandwidth it will rate-limit the traffic, and so your
A/V experience will suffer. And that's assuming there's enough
dual-stacked relays... if there aren't, it won't be possible to find a
relay that they can reach over IPv4 and you can reach over IPv6 that has
available bandwidth.
Matthew Kaufman
