Adguard - DNS over HTTP3 - VPN policy

Routers
1

Hi guys,

I have a Flint 2, and I’m facing problems with having DNS over HTTP3 (h3://…) activated on Adguard when using the VPN policy together.
All the other DNS encryption(DOH,DOT,DOQ) works well with VPN policy ON. Only with DOH3, I’m facing a problem connecting to the internet.

If I turn OFF the VPN policy, The DOH3 immediately starts to work fine again.
My opinion is that the VPN policy somehow messes with the Adguard DOH3 connection.

FYI, The VPN policy also messes with the Controld CLI. I can NOT use it when my VPN Policy is activated.

(I must use a VPN policy to enable VPN Wireguard on the Guest’s Wifi.)

Any thoughts? Workaround?

Thanks

2

Never tried with h3.
I found last comment about solved issue

3

Actually, it is working well if I disable the VPN Policy.

With VPN Policy ON:
Adguard QUIC: Working
Adguard DOH: Working
Adguard DOT: Working
Adguard DOH3: Not working
Controld CLI: Not working

With VPN Policy OFF:
Adguard QUIC: Working
Adguard DOH: Working
Adguard DOT: Working
Adguard DOH3: Working
Controld CLI: Working

Any reason for that? Does anyone know how to solve this?

5

Well, that’s pretty strange because I am using Adguard with h3 (NextDns) AND VPN policies togheter absolutely without problems.
What kind of policy are you using? (based on client device, target domain ip etc…).
Have you properly configured the Bootstrap DNS servers?

6

Very interesting…
I’m using Wireguard with a VPN policy based on VLANs ( I want the VPN connection on my Guest network only).

Have you properly configured the Bootstrap DNS servers?

What is that? Do I need to configure something else if I want to use DOH3 with a VPN? activated?

Thanks in advance