Thanks to this guy for this awesome post: https://www.reddit.com/r/pihole/comments/5g249i/tip_redirect_all_dns_to_pihole_with_mikrotik/

Basically, you need to do this:

  • Change 192.168.88.110 to your pi hole IP
  • Change 192.168.88.0/24 to your subnet

#Make sure all DNS goes to pihole IP address

chain=dstnat action=dst-nat to-addresses=192.168.88.110 protocol=udp src-address=!192.168.88.110 dst-address=!192.168.88.110 dst-port=53

chain=dstnat action=dst-nat to-addresses=192.168.88.110 protocol=tcp src-address=!192.168.88.110 dst-address=!192.168.1.2 dst-port=53

#Hairpin NAT

#Masquerade router IP 

#These not really needed. I kept mine so its one IP (router IP) source

chain=srcnat action=masquerade protocol=udp src-address=192.168.88.0/24 dst-address=192.168.88.110 dst-port=53 

chain=srcnat action=masquerade protocol=tcp src-address=192.168.88.0/24dst-address=192.168.88.110 dst-port=53

chain=srcnat action=masquerade protocol=udp src-address=192.168.6.0/24 dst-address=192.168.88.110 dst-port=53 

chain=srcnat action=masquerade protocol=tcp src-address=192.168.6.0/24dst-address=192.168.88.110 dst-port=53

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