How to Add Another Network Interface to PiHole

pihole does not allow you to use multiple network interfaces through the UI.

your only option is to select the permit all origins options

there's a bunch of workarounds online that don't work but here's one that does.

get a list of your network interfaces using by running the command below

cat /etc/network/interfaces

this will get you a response similar to the one below where you have two interfaces, named eth0 and net1. you want to make a note of these names

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
        address 192.168.10.50/24
        gateway 192.168.10.1

auto net1
iface net1 inet static
        address 192.168.0.51/24
        gateway 192.168.0.1

then run the command below to open an editor where you want to add each of the interfaces we noted above

nano /etc/dnsmasq.d/99-interfaces.conf

interface=eth0
interface=net1

save file and restart your pihole instance – you should have pihole serving dns requests to both of your interfaces.