Custom dns not working when connection to Wireguard VPN

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smk87
DD-WRT Novice


Joined: 24 Oct 2025
Posts: 5
PostPosted: Sat Nov 15, 2025 9:14    Post subject: Custom dns not working when connection to Wireguard VPN Reply with quote
Hello. I am using Surfshark VPN via Setup/Tunnels. It's working fine. But I want to use a custom DNS server (76.76.2.32, 76.76.10.32) from Control D instead of using Surfshark's DNS. I saw various solutions in many places and tried setting the static DNS, DNSmasq commands, iptable commands, etc. But nothing is working; it is still using Surfshark's DNS. If I don't use the VPN, then the custom DNS works.

Firmware: DD-WRT v3.0-r62540 std (11/05/25)
Router: TL-WR940N V6

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egc
DD-WRT Guru


Joined: 18 Mar 2014
Posts: 13880
Location: Netherlands
PostPosted: Sat Nov 15, 2025 9:54    Post subject: Reply with quote
Surfshark might just intercept all your DNS53, Mullvad also does this, with Mullvad you can opt out.

Ask Surfshark

Better use encrypted DNS that cannot be intercepted
_________________
Routers:Netgear R7000, R6400v1, R6400v2, EA6900 (XvortexCFE), E2000, E1200v1, WRT54GS v1.
Install guide R6400v2, R6700v3,XR300:https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=316399
Install guide R7800/XR500: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=320614
Forum Guide Lines (important read):https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=324087
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smk87
DD-WRT Novice


Joined: 24 Oct 2025
Posts: 5
PostPosted: Sat Nov 15, 2025 10:10    Post subject: Reply with quote
egc wrote:
Surfshark might just intercept all your DNS53, Mullvad also does this, with Mullvad you can opt out.

Ask Surfshark

Better use encrypted DNS that cannot be intercepted


According to this reddit it seems it should work: https://www.reddit.com/r/surfshark/comments/1eoldzj/i_want_to_use_3rd_party_dns_like_adguard_or/?rdt=34777

My router doesn't support encypted dns sadly. Also, I don't want to setup dns in the client level. I want to setup it on the router level so that all the device connected to the router use it.
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egc
DD-WRT Guru


Joined: 18 Mar 2014
Posts: 13880
Location: Netherlands
PostPosted: Sat Nov 15, 2025 10:20    Post subject: Reply with quote
Ask surfshark you are paying them if they intercept DNS53 and if you can opt out

If that is not possible get a better router, your router looks like to have 4 MB flash and 32 MB RAM that is not usable any more

Routers with sufficient resources have standard encrypted DNS e.g. SmartDNS, Unbound etc.
_________________
Routers:Netgear R7000, R6400v1, R6400v2, EA6900 (XvortexCFE), E2000, E1200v1, WRT54GS v1.
Install guide R6400v2, R6700v3,XR300:https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=316399
Install guide R7800/XR500: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=320614
Forum Guide Lines (important read):https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=324087
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