Bypass pihole for certain IP addresses.

iptables-pihold-bypass.sh

#!/bin/bash

# -- Assumptions/Warnings:
# -- You're not using any kind of NAT or custom iptables rules already on the Pi (as these will be wiped)
# -- <PUT_IP_ADDRESS_HERE> is the device you wish to exclude
# -- 1.1.1.1 is the DNS server you wish excluded devices to use (this is the cloudflare server)
# -- stolen from https://www.reddit.com/r/pihole/comments/56y6lb/ignore_one_device_completely/d8niqzi
# Run as root/sudo it.

sysctl net.ipv4.ip_forward=1

iptables -F
iptables -t nat -F
iptables -X

iptables -t nat -A PREROUTING -s <PUT_IP_ADDRESS_HERE> -p tcp --dport 53 -j DNAT --to-destination 1.1.1.1:53
iptables -t nat -A PREROUTING -s <PUT_IP_ADDRESS_HERE> -p udp --dport 53 -j DNAT --to-destination 1.1.1.1:53

iptables -t nat -A POSTROUTING -j MASQUERADE