Using the Apple Airport Extreme with Comcast Native IPv6
The Apple Airport Extreme works well with Comcast Native IPv6. Specific application notes are included below.
Any Apple Airport Extreme released in the last three years with firmware 7.6.1 or newer provides both IPv6 native connectivity and IPv4 NAT connectivity. Comcast Business Internet assigns a dynamic /128 address for the WAN connection and delegates a /56 prefix for LAN use. Since the Airport has one LAN, common to both Ethernet and WiFi, it uses a /64 prefix obtained from the /56 delegation. IPv6 DNS query settings are also provided to the LAN connected systems.
The IPv6 specific configuration steps below assume a standard setup for IPv4 and Comcast connections.
Using Airport Utility 6.1 or newer:
Select the Airport Extreme and click Edit
Select the Internet tab and click Internet Options...
Configure IPv6: Automatically
IPv6 Mode: Native
Check Enable IPv6 Connection Sharing
Update and Exit
IPv6 Application Notes -
Have patience while waiting for Comcast supplied IPv6 parameters to appear. It takes a while.
In OS X, configure IPv6: Automatically in the appropriate interface settings.
In Windows 7 and later, IPV6 is configured by default.
Comcast's customer IPv6 addressing is all dynamic and, at this time, no static IPv6 addressing is offered.
For your end system DNS entries, use a dual-stack dynamic DNS updater on each system.
When configuring a dynamic DNS updater, be certain to select the Prefix:EUI-64 address and not a privacy address.