The real problem isn't address exhaustion, it's managing the migration from IPv4 to IPv6 and running mixed networks in the interim. I deal with 3 ISPs on a regu

The real problem isn't address exhaustion, it's managing the migration from IPv4 to IPv6 and running mixed networks in the interim. I deal with 3 ISPs on a regular basis. Of which only 1 (Comcast, surprisingly enough) has their act together and can provide you with IPv6 connectivity. Meanwhile out of 5 datacenters I regularly deal with there is not a single one that can provide a direct IPv6 routing to the rack. So for the moment, at least for the networks I deal with it's IPv4 and tunneled IPv6 and given the nature of the business, IPv6 is really not on my priority list, and won't be until it actually saves people enough money to cover the switching costs.