I switched to U-verse from DSL last week for a higher connection speed and have two related questions concerning IPv6 support, the answer to either one of which would solve my problem: AT&T enabled IPv6 in the 3600HGV since my Hurricane Electric tunnel broke with U-verse. I set up the E4200 with the router behind a router/DMZPlus configuration. The E4200 is set for automatic IPv6 configuration. It gets assigned a link-local address for the 3600HGV, but no DNS. While IPv4 works as expected on the LAN connected to the E4200, the connected devices are not getting global unicast addresses assigned, just their link-local IPv6 addresses. I enabled DHCPv6 in the 3600 but that didn't help. In contrast, at another site I have a similar situation with an E1200 connected to a HughesNet Gen4 router via DHCP and the automatic IPv6 configuration works as expected, with the devices getting global unicast addresses assigned properly. I've temporarily removed the E4200 and am using the 3600HGV directly so I can access external IPv6 destinations, but the problem is the 3600 firewall does not seem to have the IPv6 functionality of the E4200 to enable external access to an IPv6 device on my LAN. So the question is either how do I restore full IPv6 functionality on the E4200 behind the 3600HGV OR how do I configure the 3600HGV to pass specific IPv6 addresses/ports since the firewall configuration options appear to be limited to port-forwarding for IPv4.
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