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As reported elsewhere, IPv6 tunneling seems to be broken in the 7.6.3 update.
After updating the Airport Extreme (4th gen) tells me that the IPv6 connection is broken and wireless clients are not assigned IPv6 addresses. I tried several different IPv6 tunnels (tunnelbroker, etc) and none worked in 7.6.3. Reverting to 7.6.1 immediately solved the problem.
I lost my ipv6 tunneling after a power outage restarted my Airport Extreme, not sure why that triggered things but I traced it to the 7.6.3 update, perhaps that hadn't loaded until the restart. I reverted to 7.6.1 and the ipv6 tunnel worked again, both in automatic mode - http://test-ipv6.com/ gave automatic 7/10 because using 4 -> 6 tunnel, and in manual mode using Hurricane Electric tunnelbroker, which tested at 10/10. I was able to get it working under 7.6.3 after realizing that Airport Utility 5.6 does not update ipv6 delegated prefix, which is the same as ip6 lan address but with the /64 or whatever added to the end. I updated that field using Airport Utility 6.2 and all is good.
I like Utility 5.6 better than 6.2 but in this case it doesn't do the full job. Hope that helps someone!
Same thing here. Apple's track record with AEBS firmware is outrageously poor. My parents have an AEBS 3rd gen and it refuses to allow any value in the IPv6 Delegated Prefix field with 7.6.3. I don't even have to update the configuration. Simply click 'save' on the IPv6 options screen, reopen it, and the value that was there is now blank.
I guess I'll have to stick with 7.6.1 for now.
The update for the AirPort Utility that was released today, June 10, 2013, with version 6.3 (630.34) allowed me to update the firmware of my 1st Gen Time Capsule to 7.6.3 and then properly configure my IPV6 tunneling with tunnelbroker.net.
This issue is resolved as far as I am concerned.
Good luck to everyone else.
Confirmed. In order to get it to allow me to save that screen, I had to provide both a delegated prefix and a LAN IP address for the airport, but it works perfectly now.
IPv6 tunneling broken after 7.6.3 update
