Archer C7 Cascading IPv6
My current network setup is the following
DSL line -> ISP VDSL Modem-Router -> Archer C7 (DMZed) -> Local network.
The ISP VDSL Modem can't be in bridge mode as I need it for the VoIP service because they don't provide the SIP details.
The setup is working fine for everything relating to IPv4, including NAT, however I can't get IPv6 in my local network devices.
If I connect one of my computers directly to the ISP modem that computer gets an IPv6 address in the format of: 2001:bb6:896 ...
However, when the Archer C7 is not getting an IPv6 address:
Is there something I am missing here? It's the first time I'm trying to configure IPv6.