North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical RE: IPv6 Wow
Nathan Ward wrote: ... > 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. Not quite correct. 6to4 does not require transiting a relay if the target is another 6to4 site. What this means is that a clueful content provider will put up a 6to4 router alongside whatever native service they provide, then populate the dns with both the native and 6to4 address. A properly implemented client will do the longest prefix match against that set, so a 6to4 client will go directly to the content provider's 6to4 router, while a native client will take the direct path. The only time an anycast relay needs to be used is when the server is native-only and the client is 6to4-only. Tony
|