How to define a custom port when push "dhcp-option DNS"?

[deleted]

Hello,

I have set my private DNS server to be reached over port 65. How can I set the port accordingly on server.conf to be pushed down to the clients??

push "dhcp-option DNS [2a01:4f8:1c17:7709::1]:65"
push "dhcp-option DNS 10.8.0.1:65"

Thanks,

TinCanTech

Openvpn does not configure your DNS Service, at all. It certainly doesn't push port numbers.

[deleted]

Maybe this is a misunderstanding. But this configuration is certainly possible. See here: https://openvpn.net/community-resources/pushing-dhcp-options-to-clients/

The server pushes the DNS settings to the client to utilise.

TinCanTech

All Openvpn actually does is to push an IP address, what happens to that is different for all clients.

Windows uses the PDHCP Server to configure your adaptor, Linux must use a script, for the time being.

[deleted]

Ok great. Is there a way to also specify the port in addition to the IP address?

TinCanTech

houmie75 wrote Is there a way to also specify the port in addition to the IP address?

You can specify it as you have already done:

houmie75 wrote

push "dhcp-option DNS 10.8.0.1:65"

but none of the services that use this option know how to use the Port parameter.

TinCanTech

You can see an example here:
https://github.com/alfredopalhares/openvpn-update-resolv-conf

https://github.com/OpenVPN/openvpn/tree/master/contrib/pull-resolv-conf

[deleted]

Ah I see. This only works on Linux clients though. Won't be possible on iOS.

No worries, I have to keep the port as standard then.

Thanks

TinCanTech

What difference does it make which port DNS uses ?