IPv6 - Preserve the DUID used for WAN DHCP-PD in the configuration file
Preserve the DUID used to obtain the DHCP-PD addressing on the WAN in config.xml
Secondary request to then make this editable in webConfigurator.
When you reinstall or move to new hardware, a new DUID is generated. This results in new IPv6 address space being assigned by the service provider. If you have been assigned a /56 or /60 and used the networks for manual assignment in OpenVPN or firewall rules for example, then you need to touch all those configurations and make the changes to the new networks.
If the DUID was maintained in config.xml, then you would be able to get the same address space back after re-imaging or moving to new hardware, upon restoring the configuration.
Secondary, the DUID in config.xml should then be user editable in the GUI. Use case ... If you initially set the WAN DHCP-PD prefix length to the default /64 then decide you need a /60, it creates problems because the service provider (Comcast) will keep issuing a /64 based on the DUID and not flip the DHCP-PD lease to a /60 automatically on the next request. If the DUID was user editable, then it could be changed on-demand and the provider would see you as a new device and instantly assign a different DHCP-PD lease.