Hi.
Reading the docs I saw Dnsmasq is the recommended DHCP server. I can't figure out how to advertise a specific IP as the default DNS server for DHCP clients though.
I'm running pi-hole on 192.168.111.130. I've configured that as the default DNS server of OPNsense itself via System/Settings/General.
Also I've gotten this working when using ISC DHCPv4. But I can't figure out what the right setting is with Dnsmasq.
I've also attempted setting it via 'dhcp-option=6,192.168.111.130' in '/usr/local/etc/dnsmasq.conf.d/'. But this results in a log line in Dnsmasq 'Ignoring duplicate dhcp-option 6'.
I can see 'dhcp-option=6,0.0.0.0' in '/usr/local/etc/dnsmasq.conf' which I guess is overriding my option.
Why don't you just use the DHCP options to set it instead of fiddling with custom settings?
dns-server.png