# No ad blocking

**URL:** <https://discourse.pi-hole.net/t/no-ad-blocking/16558>\
**Category:** Help\
**Created:** [January 28, 2019, 4:43am UTC](https://discourse.pi-hole.net/t/no-ad-blocking/16558 "2019-01-28T04:43:05Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![jfb](https://discourse-cdn.pi-hole.net/user_avatar/discourse.pi-hole.net/jfb/32/4332_2.png) [@jfb](https://discourse.pi-hole.net/u/jfb)\
**Post date:** [January 28, 2019, 5:40pm UTC](https://discourse.pi-hole.net/t/no-ad-blocking/16558/5 "2019-01-28T17:40:46Z")

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> [@Shesk](#):
>
> I saw that there were comments in the previous thread that sites with adds were not visited during the debug script

Not following you here.

During debug, the Pi-Hole is tested to see if it can resolve a known blocked domain (which is chosen from your gravity list) using both the loopback address and the IP of the Pi-Hole. Then, a known good domain is requested via Google DNS to verify that the Pi can reach the internet. In your debug log, it looks like this. This shows that your Pi-Hole is working properly. Everything in your debug log is normal.

```
*** [DIAGNOSING]: Name resolution (IPv4) using a random blocked domain and a known ad-serving domain
[✓] bor-bogdanych.com is 0.0.0.0 via localhost (127.0.0.1)
[✓] bor-bogdanych.com is 0.0.0.0 via Pi-hole (192.168.2.50)
[✓] doubleclick.com is 172.217.1.206 via a remote, public DNS server (8.8.8.8)

```

If you are seeing ads, it is likely that there is another DNS path that clients are using, bypassing Pi-Hole.

> [@Shesk](#):
>
> For example, can I have the DNS Filter set to OpenDNS Home and have the DHCP DNS set to the pi-hole?

Typically, no. If you have the DNS filter set this way, some or all of your DNS traffic will go directly to OpenDNS and not through Pi-Hole.

> [@Why should Pi-hole be my only DNS server?](https://discourse.pi-hole.net/t/why-should-pi-hole-be-my-only-dns-server/3376):
>
> 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 serv…

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