RP4 (4GB) running Retro Pie.
Router is a vodafone gigabox (ISP supplied)
After configuring the pihole DNS IP on the router it causes a network wide internet failure - all clients fail to reach the internet. Logs in pihole appear to be routing queries just fine (no Pi-Hole Diagnostics being flagged)
sudo nano /etc/resolv.conf contains:
nameserver 1.1.1.1
Any further steps or troubleshooting recommended?
What is pihole using for an upstream?
If your voda box is routing to your pihole, and your pihole is upstreaming back to voda then it'll never go anywhere
it may be easiest to turn off the dhcp in your voda box, and leave its dns settings defaulted, then enable the dhcp in your pihole and set the router/gateway to be your dns upstream
I've tried a number of different upstreams, google, OpenDNS. Currently its set to Cloudflare and a custom setting of: 89.19.64.164 (Vodafone ISP DNS)
Will turning off the DHCP on the Vodafone box and enabling on pihole allow wifi clients to retrieve addresses? I hadn't considered it as an option as I was looking for the simplest possible implementation but if you think this may work I'll give a go.
Should do. That's (roughly) how my network is set up. Even clients of my WiFi extender get the DHCP addresses. If it doesn't, the voda box needs to go in the bin 
While you're at it, once you're up and running https://firebog.net has loads of great lists to block.
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