One big advantage of IPv6 is that routers will not have to deal with fragmentation. At higher debits, it should make a pretty important difference. http://en.wi

One big advantage of IPv6 is that routers will not have to deal with fragmentation. At higher debits, it should make a pretty important difference. http://en.wikipedia.org/wiki/IPv6_packet#Fragmentation http://en.wikipedia.org/wiki/IPv6_packet#Fragmentation IPv6 also deals better with packet headers, so it's easier to calculate for routers. I suspect however this will make more of a difference for high end routers with lots of traffic. As others have mentioned, the dual-stack transition does require more resources. Then again, you can implement NAT64 (or 464xlat), which seem to become more realistic/robust/more widespread solutions (running dual-stack also means managing two layers of routes, two layers of firewalls, etc). (Disclaimer: this is not my day job, I just find it lots of fun to play with on my local network and the Montreal local city mesh.)