Pihole as secondary dns
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 Hi. I am fairly new to pfsense but have managed to get it working. I have a pihole on a VM which works wonderfully but blocks some google ads so it means I cant click on shopping items or sponsored items when searching. This is why I don't have the pihole to be the only dns server This is why I have one SSID in my wifi ap with pihole dns only and the other set to the pfsense. The problem is, I get these huge pauses when loading some websites when I use pihole that I didn't when I had my draytek 3900. Switching to the other SSID (non pihole) works straight away. Please help with pfsense and or pihole settings. 
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 I'm not sure I can answer your question though I too used a Pi-Hole. My use of the Pi-Hole was to block all the ads and other stuff I didn't want. My router did DHCP. So when I switched from Pi-Hole and consumer grade router to pfSense (pfS) I looked into the pfBlocker (pfB) package and found it can block everything the Pi-Hole could and more. I was even able to add my custom block lists from the Pi-Hole. I did it this way. 
 https://forum.netgate.com/topic/175993/how-i-add-custom-pi-hole-hosts-files-or-others-to-pfblockerThe goal was to remove the router and Pi-Hole from the network. And I succeeded. I took my time, about a week, of trial and error to get pfS/pfB working the way I wanted. Take Care and Enjoy! 
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 @qbhatti said in Pihole as secondary dns: blocks some google ads so it means I cant click on shopping items or sponsored items when searching. Seems like a problem of the ad blocking list your are using in Pihole. 
 You could try a safe one like OISD Basic that has no false positives.