After installing AdGuard Home in OpenWrt 23.05.4 following the official guide in the OpenWrt documentation, there will be a problem at the end that the OpenWrt router will loose internet connectivity, and a fix has to be applied to the /etc/adguardhome.yaml file.
Initially the adguardhome.yaml file will only have the IPv4 address of the router in the dns: --> bind_hosts: section:
dns:
bind_hosts:
- 192.168.1.1
port: 53
And you have to add the localhost information for IPv4 and IPv6, also the IPv6 address of the router, something like this:
dns:
bind_hosts:
- 127.0.0.1
- ::1
- 192.168.1.1
- fd1a:c860:7174::1
port: 53
In my case, I am using my OpenWrt router downstream a TMHI (T-Mobile Home Internet) gateway, who doesn't provide IPv6 PD (Prefix Delegation), therefore I had to configure the OpenWrt router in NDP-Proxy mode (relay mode), that means the router doesn't have an IPv6 address, it just passthrough the IPv6 addresses from the upstream TMHI gateway and the client devices, downstream the OpenWrt router.
In this scenario should I leave blank the IPv6 address in the adguardhome.yaml file or add the IPv6 address of the TMHI gateway , who is acting as the DHCPv6 server? Sorry if this is a basic question, but my IPv6 knowledge is limited, Thank you