> I think most corporate network should be able to do pure IPv6 internally, and then tunnel to IPv4 at the gateway. With the amount of legacy applications and

> I think most corporate network should be able to do pure IPv6 internally, and then tunnel to IPv4 at the gateway. With the amount of legacy applications and systems populating the typical internal network that idea won't be going far. Where IPv6 actually can be used and should be deployed in addition to v4 is in the perimeter networks. Offering or being able to use services on the internet over v6 (via proxy) overcomes the real shortage of ipv4 addresses in the internet at large. I expect internal networks to be last places to be moved to IPv6 only.