-----Original Message----- From: Matthew Kaufman [mailto:matthew@matthew.at] Sent: Thursday, January 06, 2011 6:55 PM To: Owen DeLong Cc: Nanog Operators' Group Subject: Re: Problems with removing NAT from a network
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,
Skype could make it work with direct UDP packets in about 92% of cases, per Google's published direct-to-direct statistic at http://code.google.com/apis/talk/libjingle/important_concepts.html -d
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