My setup is a BT Smart Hub providing my internet connection.
I now have a LEDE BT Home Hub 5a in a separate room. This is connected wirelessly to the BT Smart Hub and I have followed the instructions to set it up as a relayd pseudobridge. I have wired clients on the LEDE router who can connect and get an IPV4 address from the BT Smart Hub in the original Subnet and access the internet and other devices across the local network without any problem.
This is working nicely for IPV4.
However IPV6 doesn't work.
The router can get an IPV6 connection and the WWAN status gives me several addresses a
Prefix Delegated: /64, Address: /64 and a Gateway: fe80.....
However, lan devices connected to the LEDE router are not able to get an appropriate IPV6 address. I can deviate from the instructions and set up hybrid mode instead of relay mode, and then they then get an address with the appropriate prefix. However there is no IPV6 connectivity to the outside.
To be honest I am finding IPV6 extremely confusing and unintuitive.
How can I set up a route via the LEDE router and on to the BT Smart Hub for the LAN clients to access IPV6?