> Downloading over IPv6 is still almost always slower than over > IPv4, but for day-to-day stuff the performance difference > isn't an issue with native IPv6 connectivity (for me). 6to4 > is a crapshoot, it can be reasonable or it can completely > fail, with everything in between. That will improve as more people set up 6to4 relay services http://www.getipv6.info/index.php/First_Steps_for_ISPs#Setup_A_6to4_Rela y > But it's never going to be better than native IPv4, obviously. Not so. Native IPv4 will route packets by choosing the best path. Part of that path decision will be made via BGP which allows network administrators to remove certain paths from the list of possibilities. When a 6to4 relay is used, the destination IPv4 address is that of the tunnel endpoint, not the final destination. It is entirely possible that a tunnel endpoint may take the packets into an AS which would not otherwise be used and which IS a better path than would be chosen by pure IPv4 routing. Back in the 1990s some shrewd American ISPs used this fact to get free transit from certain ASNs because the traffic to a tunnel endpoint qualified under the peering agreement. --Michael Dillon _______________________________________________ Ietf@xxxxxxxx https://www1.ietf.org/mailman/listinfo/ietf