AS-750S Slate Rotuer: DNS fix to allow use of internal DNS server with Wireguard Client

Technical Support for Routers
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We had to edit /etc/init.d/wireguard to use the DNS entry on the Slate Wireguard Client configuration page. This edit modifies the dnsmasq DHCP configuration to deliver the configured DNS server when the Wireguard VPN comes up. Unfortunately this fix requires the computer clients to renew their lease after the VPN is established to retrieve the new DNS entry. Without these changes, we were unable to make the Slate clients direct their DNS queries to the configured DNS server through the tunnel.

We also modified /etc/config/dhcp to deliver local search domains. This fix is less than ideal because it can not be configured for each VPN server attached to. It is persistent between VPNs.

Hopefully this will help someone else using the Slate router with Wireguard.

Here is a link to my blog that describes the fix.

I would have posted the information here but I got an error about “new users only permitted two links” or something like that.

2 Likes
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This seem to explain my dns issues, thanks.
Hopefully this gets fixed in the firmware soon.

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@kyson-lok can you pls have a check of this one?

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This solution is really a temporary work around. It would be better if the client did not have to renew a lease after the VPN connects. We could not figure out why the distribution does not work.

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This clearly needs to be fiexed in the firmware. It is a problem that several people have posted about. It is affects not only WG but also OVPN, i.e. DNS through VPN tunnel in general.

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Dont reply on a 5-year old post. Just make your own thread with details.