How to configure a local IPv6 address prefix on Asuswrt-Merlin?

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New Around Here

I've been looking to setup something similar myself.

I found this old thread here and the dhcpc-event script seems to set the IPv6 address on the router. My current IPv6 settings on the router work for my ISP, and by default appear to setup dnsmasq to properly advertise all IPv6 prefixes active in the router.

IPv6 settings:
Connection type - Native
DHCP-PD - Enabled
Release prefix on exit - Enabled
Auto Configuration Setting - Stateless
Enable Router Advertisement - Enabled

Unfortunately, this setup does not seem reliable. It appears that every time the router updates it's ISP-provided IPv6 address/prefix it's dropping the statically set one I use in the script. Even though the script is theoretically supposed to re-add the address on all dhcpc events, it still appears to drop from time to time.

It hasn't been the biggest concern thus far, but I'd like to be able to get this working if possible. It looks like some other routers have this functionality built in with a simple checkbox.

Let me know if you or anyone else have any idea!

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