Are my Router Settings Correct?

[dilip_prasad]

I have attached my router settings where there are few Settings which i am not sure if it has to be enabled. Kindly help me. At times the PI Hole doesn't seem to resolve even google.com. Just wanted to rule out the possibilities

I am concerned about

1. Enable Primary DHCP server
2. Enable DHCP Relay
3. Enable Option 125

Also when will by Secondary DNS Server be used ? When my pihole is down?

[dilip_prasad]

No one to Help ?

[jfb]

You have a "secondary" DNS server assigned, and this is likely allowing some of the DNS traffic to go to a DNS server other than Pi-hole. When clients have multiple DNS servers, they are free to use whichever they choose.

Why should Pi-hole be my only DNS server?

Reduced Ad Blocking Capability The main reason you should Pi-hole as your only DNS server is that you will see increased performance in the blocking of ads. If you have two DNS servers (Pi-hole and something else), your network clients may not always query Pi-hole for name resolution. If a query happens to be answered from a non-Pi-hole DNS server, your block lists will not apply (since that DNS server doesn't know about them). All Queries Need To Go Through Pi-hole First Since other DNS se…

Read the manual for your router for descriptions of the other three options you noted.

[dilip_prasad]

Thank you Very much, it makes sense now. I thought by adding Secondary DNS the router would use it only if the PiHole Is Down, seems it is otherwise.

Appreciate your help