[L J]

Just setting up IPv6 on my gateway router, Router 1. I followed egc's guide, 2025-Apr-27, https://raw.githubusercontent.com/egc112/ddwrt/main/IPv6%20DNSMasq%20IPv6%20RA.pdf to the letter. The PD is /56 (per the ISP's router GUI), Static DNS 1 is 2620:fe::fe (Quad9) and Static DNS 2 is 2606:1a40::1 (ControlD) and I setup for interfaces br0, (VLAN 1) and br2, (VLAN 4) using Dnsmasq IPv6 Settings.
I included the Static IPv6 lease, add in DNSMasq additional options:
dhcp-host=D0:AB:F5:51:CC:AA,nitro,[::400],30m (Should the MAC address D0:AB:F5:51:CC:AA be changed to my router's MAC? And do I need to include dhcp-host=D0:AB:F5:51:CC:AA,nitro,192.168.13.49,30m shown in the Additional Options on Page 2?)

Also read this post https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=338516 as my ISP also uses Xfinity.

Everything looks good: The router receives a WAN IPv6 address, I reviewed cat /tmp/dhcp6c.conf and cat /tmp/dnsmasq.conf, however the router does not give out IPv6 addresses to any device, Windows, MacOS, iOS, Android even after a restart of the router and the devices. I do receive a Link-local IPv6 address on my Windows laptop of fe80::7396:2647:40ad:ad48%4.

Any suggestions as to what I may be missing or where I should look next?

[DWCruiser]

Firstly, I am sorry for not being helpful in answering your question.

However, I can't help but wondering about the use of IPv6 internally.

I mean IPV6 was created to accommodate the running out of external IPV4 addresses. That said, there are still more than plenty of private addresses using IPV4.

10.0.0.0/8, (or 16,777,216 addresses)
172.16.0.0 to 172.31.0.0 (1,048,576), and
192.168.0.0/16 (65,536)

Unless, you have a peculiar reason such as learning about IPV6 with your home equipment!

[Per Yngve Berg]

Ditch the ISP Router. It does not probably have a Wide DHCP Server that hand out PD.

[L J]

DWC
Trying to learn. IPv6 is the future and I want to stay ahead of the curve.


PYB
If by "Ditch the ISP Router." do you mean put the ISP router in bridge mode? I would prefer not doing that. I like to keep it and it's 5 GHz channel as a backup to my home network if something goes wrong with a flash or a setup on my dd-wrt routers.

I have included an attachment showing my ISP's network settings. Can you tell if they have a Wide DHCP server from this? I assumed it did because of the /56 at the end of Delegated Prefix: 2604:3d08:2f92:d200::/56.

At some point I might try bridging the ISP to see if that works but will continue to look for another solution going through the ISP's router.

Thank you for your suggestion.