[RESOLVED] Force DNS redirect for untrusted VLAN with Pihole

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ho1Aetoo
DD-WRT Guru


Joined: 19 Feb 2019
Posts: 3005
Location: Germany
PostPosted: Wed Mar 20, 2024 21:32    Post subject: Reply with quote
Code:
iptables -t nat -I PREROUTING -i br1 ! -d $(nvram get br1_ipaddr) -p tcp --dport 53 -j DNAT --to $(nvram get br1_ipaddr):53
iptables -t nat -I PREROUTING -i br1 ! -d $(nvram get br1_ipaddr) -p udp --dport 53 -j DNAT --to $(nvram get br1_ipaddr):53

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Quickstart guides:
use Pi-Hole as simple DNS-Server with DD-WRT
VLAN configuration via GUI - 1 CPU port
VLAN configuration via GUI - 2 CPU ports (R7800, EA8500 etc)

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Marvell OCTEON TX2 - QHora-322 - OpenWrt 23.05.3 - Gateway
Qualcomm IPQ8065 - R7800 - DD-WRT - WAP
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rnix
DD-WRT User


Joined: 23 Feb 2016
Posts: 200
PostPosted: Wed Mar 20, 2024 21:48    Post subject: Reply with quote
It worked fine and I now feel embarrased as my previous setup was indeed a mess Embarassed Thank you ho1Aetoo

Code:

iptables -t nat -I PREROUTING -i br0 ! -s 10.10.10.254 ! -d $(nvram get lan_ipaddr) -p tcp --dport 53 -j DNAT --to $(nvram get lan_ipaddr):53
iptables -t nat -I PREROUTING -i br0 ! -s 10.10.10.254 ! -d $(nvram get lan_ipaddr) -p udp --dport 53 -j DNAT --to $(nvram get lan_ipaddr):53

iptables -t nat -I PREROUTING -i br1 ! -d $(nvram get br1_ipaddr) -p tcp --dport 53 -j DNAT --to $(nvram get br1_ipaddr):53
iptables -t nat -I PREROUTING -i br1 ! -d $(nvram get br1_ipaddr) -p udp --dport 53 -j DNAT --to $(nvram get br1_ipaddr):53


I will also edit my earlier post so someone would not mistakenly use incorrect rules.
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