Openwrt, openvpn and udp port forwarding not working

[giurti]

I'm try configuring port forwarding from wan to openvpn. It works fine with TCP mode, but do not works whit UDP mode.

It works fine whitout port forwording; I try configuring traffic rule to allow UDP traffic from 1194 WAN port to 1194 device port: it works fine.

Version:
OpenWrt 22.03.3 r20028-43d71ad93e / LuCI openwrt-22.03 branch git-23.039.29681-007c243. Router Netgear WNDR3700 v2.

Before of this version, I had old version openwrt-15.05.1: UDP port forwarding worked fine with that old version.

Why

[egc]

Not sure how you have setup.

If you have the OpenVPN server running on the router itself you need a Traffic Rule to allow port 1194.

If the OpenVPN server runs on another client in your LAN then you have to port forward to that client.

I have an OpenVPN server running on my router and have this traffic rule:

Furthermore the OpenVPN interface is added to the LAN zone to allow traffic

[giurti]

Thanks.
My openvpn runs on my router. If I try your same traffic rule setting, it works fine. But I need to change the inbound port on wan inteface. If I try to configure a port forward rule from 53 wan port to 1194 lan port, it works fine in tcp mode, but do not works in UDP mode.

[egc]

You can choose most any port you want for the OpenVPN server in the OpenVPN config so that you do not need a port forward but can use a Traffic rule.

Port 53 might not be a good choice as that can already be in use for DNS.

[giurti]

I try many ports, (ex. 8081): udp forwarding do not work never.
I need 53 udp port because that is only port not blocket from my office's firewall.

[pavelgl]

@giurti

I try to configure a port forward rule from 53 wan port to 1194 lan port

Try a redirect to the wan port (without specifying destination zone and internal ip address).

[giurti]

Solved.
UDP port forwarding needs your configurazione.
Thanks