North American Network Operators Group|
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Re: IPv6 Wow
On 13/10/2008, at 7:24 PM, Mikael Abrahamsson wrote:
On Sun, 12 Oct 2008, Daniel Senie wrote:
Long term I agree, but short term I prefer Teredo for regular end users' experience. Where regular end user means an end user communicates with a relatively small number of remote hosts.
1) 6to4 currently lacks a testing mechanism to ensure that it is functioning at startup, and that it is still functioning. Packets are sent and blackholed by the network, resulting in a 90s timeout waiting for a response to the three SYN packets in a TCP connection set up. 90s is a long time for users today, and my experience shows that they consider a service to be 'broken' before they wait for the timeout to expire.
2) If Teredo relays are deployed close to the service (ie. content, etc.) then performance is almost equivalent to IPv4. 6to4 relies on relays being close to both the client and the server, which requires end users' ISPs to build at least *some* IPv6 infrastructure, maintain transit, etc. When you consider that this infrastructure and transit is quite likely to be over long tunnels to weird parts of the world, this is a bad thing. Putting relays close to the content helps for the reverse path (ie. content -> client), however the forward path (client -> content) is likely to perform poorly.
-- Nathan Ward