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Redirect all DNS traffic to the pi.hole
source link: https://schinckel.net/2020/07/08/redirect-all-dns-traffic-to-the-pi.hole/
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Redirect all DNS traffic to the pi.hole
This is more to remind me than anything else, but I figured out how to configure my firewall to redirect all DNS traffic (except from the pihole itself) to the pihole.
My pihole has an IP address of 10.1.1.3:
iptables -t nat -A PREROUTING -i br-lan ! -s 10.1.1.3 -p tcp --dport 53 -j DNAT --to 10.1.1.3
iptables -t nat -A PREROUTING -i br-lan ! -s 10.1.1.3 -p udp --dport 53 -j DNAT --to 10.1.1.3
iptables -t nat -A POSTROUTING -j MASQUERADE
In OpenWrt, this needs to be pasted into Network → Firewall → Custom Rules, and then possibly reboot the router.
It is likely that a reboot is not necessary: the MASQUERADE line made me think I was still hitting the external DNS server, but it was transparently being handled by my pihole.
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