Had an Opal with version 3.x that had this issue.
Beryl with firmware 3.x/4.x still has this issue.
Beryl AX with firmware 4.4.5 still has this issue.
- IPv6: When you enable it, the router assigns a ULA prefix but it has an issue instead of being in the ULA range fd00::/8 it assigns an address like: dd15::/48 it shouldn’t start with d. Due to this bug, IPv6 its pretty useless unless you use a native address. (This was temporary solved editing /etc/init.d/gl_ipv6). This happens when using Mode NAT6.
This solution no longer applies with firmware 4.x
@alzhao You commented in Feb. 2022 that this bug was gonna be fixed with firmware 4.x but it still happens