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I have everything set up and it's working fine, but with one caveat. My OPNSense box isn't able to get software updates and ping also does not work. Any device connected to the network can access the internet and resolve addresses just fine, except for the router itself.

I have Unbound turned off in the settings. In AGH I have the boxes checked for Primary and Enable DNS.

Under System: Settings: General I have nothing listed under DNS Servers. Should I add my OPNSense box IP address here?

Under Services: DHCPv4: [LAN] I have nothing listed under DNS Servers. Should I add my OPNSense box IP address here?

If you don't use Unbound it is because you have the DNS set directly in Adguard and that is enough. What you do need to check is this:

3 - Opnsense - System - Settings -General

      DNS Servers: empty

      Untick: Do not use the local DNS service as a nameserver for this system

      Untick: Allow DNS server list to be overridden by DHCP/PPP on WAN

https://forum.opnsense.org/index.php?topic=22162.msg146626#msg146626

I verified that those settings are already in place. Could it be the WAN interface not being selected during the setup? I can't remember if I did that or not.

I have everything set up and it's working fine, but with one caveat. My OPNSense box isn't able to get software updates and ping also does not work. Any device connected to the network can access the internet and resolve addresses just fine, except for the router itself.

I have Unbound turned off in the settings. In AGH I have the boxes checked for Primary and Enable DNS.

Under System: Settings: General I have nothing listed under DNS Servers. Should I add my OPNSense box IP address here?

Under Services: DHCPv4: [LAN] I have nothing listed under DNS Servers. Should I add my OPNSense box IP address here?

Is there a reason to keep Unbound enabled when using AdGuard Home? I turned mine off entirely and everything seems to be working fine.

Also, is there a way to get hostnames to appear in AGH rather than just IP?

[System: Settings: General,]

My goal is to connect to my home network remotely so I can use my PiHole when accessing from somewhere else. I followed this guide https://homenetworkguy.com/how-to/configure-wireguard-opnsense/ and can connect to the WireGuard server and access the internet but it doesn't seem that it's using my PiHole as the DNS.

In System: Settings: General, I have the DNS Server set to my PiHole internal IP.

In Services: DHCPv4: [LAN], I have the DNS Servers set also to my PiHole internal IP.

Do I need to have a firewall rule to point VPN requests to my PiHole for DNS? Another puzzling question is which DNS server could the Wireguard server be using if not the PiHole?