IMHO, the only thing blocking ipv6 adoption is the ISP's, like Comcast. Many of the datacenters support it, the devices support it, we're ready to go just waiting on the pipes. T-Mobile is already using ipv6 for mobile, so our old ISP's are dropping the ball as usual. Carrier grade NAT will be rolled out alongside ipv6, and ipv6 adoption will accellerate exponentially as everyone will want to avoid the performance issues that NAT has, all the devices already prefer ipv6. Markets are demand driven, as soon as the clients support it, the servers will fall in line surprisingly fast. I'm not worried, ipv6 is happening, we just need to give the ISP's a kick.
Comcast is a bad example since they are furthest along deploying IPv6 of any of the major US ISPs. They have coverage for 50% of customers.
But only 1% of traffic is IPv6 mostly because customer equipment doesn't support it. Cable modems need to be upgraded to DOCSIS 3.0. Most consumer routers also don't support IPv6 including many models currently for sale. The manufacturers don't seem to have plans to release upgrades for IPv6 support. The third part firmwares like DD-WRT and OpenWRT have some support but it still isn't great. Most customers wouldn't be willing or able to install new firmware.
Thanks for the interesting facts, I didn't know that about Comcast. I still think that widespread ISP support will lead to rapid adoption, with 50% of traffic being switched over in a decade once that occurs. How old is your cable modem and router?
My cable modem and router are brand new since I deliberately bought IPv6 capable ones so I can use IPv6 when it becomes available.
Mobile seems to be the area with the most IPv6 adoption. Verizon Wireless has 25% of traffic on IPv6. Verizon required IPv6 for its LTE network, and many of the popular mobile sites like Google and Facebook support IPv6.
Mobile definitely seems to be leading the way. I know the pace of obsolescence may be slowing a bit, but I still suspect that most consumer cable modems and routers will be replaced within a decade, similar to the pace of 802.11n adoption. It is troubling that ipv4 only ones are still being sold. So many negative comments here, but I still believe ipv6 will be rapidly adopted in the coming years and that all this concern about carrier NAT and the depleted ipv4 address space will become irrelevant in short order.
