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IPv6 initial setup - almost there, what am I missing?

Hi

I'm behind my ISP's CGN so I want to setup IPv6 so i can vpn directly to my home. I've read through the forum and think im nearly there, but cant get the final piece. 

My WAN has got a v6 address from ISP DHCP and I've set up a LAN DHCP server with advertising which seems to be working fine (clients get addresses and leases appear in XG). I also have a IPv6 firewall rule allowing LAN->WAN.

However, when pinging ipv6.google.com from either XG diagnostics or a client, the DNS resolves but the ping just times out and i get 100% packet loss.

PING ipv6.google.com (2a00:1450:4009:819::200e): 32 data bytes

--- ipv6.google.com ping statistics ---
4 packets transmitted, 0 packets received, 100% packet loss

Running ipv6test.com says IPv6 unsupported. When i ran the test from the ISP router (which is now replaced by XG) it worked fine.

I've been reading about the need for NATing, which i think is where im falling down. Do i need to NAT my LAN v6 address to my WAN v6 address? If so, I can't seem to work out how to do it. 

Is this a NAT issue or am i missing another step?

Thanks for any tips!



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