VPN Passthrough from Telus T3200M to Asus RT-AX58U

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Hi, I have the Telus T3200 router in my home that have been setup for few years and everything has been working fine. Recently, I bought a new Asus RT-AX58U which I treat it as a second router. I have connected the AX58U to the LAN port of my Wi-FI extender which was setup by the Telus Technician before. Internet and the Wi-Fi connections works well for the new router. However, I need to assign a port under Port Forwarding of T3200M in order to forward the VPN port to allow VPN connection on AX58U (I have already assigned a static IP for AX58U under T3200M Web Gui) I have tried few ports such as 1194 UDP, 3000 UDP. However, after I clicked "apply", the settings cannot be successfully saved to the Router settings.

I am not going to perform a port bridge of T3200M as I read from other posts that T3200M will no longer be access via Wi-Fi after bridging the port.

Can any expert here tell me what possible port number(s) I can use for VPN Port Forwarding on T3200M so that I can access to VPN on AX58U? In addition, is there any additional settings I need to be aware of under T3200M for VPN passthrough?

Thank you!


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