Issue with Bidirectional Connectivity Between Mobile WAN and LAN on Teltonika RUTC50

NETWORKING SOLUTIONS
1

I’m currently configuring a Teltonika RUTX50 router to establish bidirectional communication between a private 5G mobile network (WAN) and a local area network (LAN). The goal is to enable seamless access from the mobile network to LAN devices and vice versa.
First configuration attempt: In this setup, the mobile WAN interface was configured with NAT enabled. I also adjusted the firewall zone settings to accept incoming traffic from the WAN zone, and set up port forwarding rules targeting a specific LAN server.

  • Access from LAN to public IP of the teltonika: Success
  • Access from LAN to internet: Success
  • Access from internet (mobile network) to public IP of the telnonika: Success
  • Access from internet (mobile network) to private LAN IP: Failed
    Second configuration attempt: In this attempt, I enabled passthrough mode on the mobile WAN interface and assigned the public IP directly to the LAN device by specifying its MAC address. The public IP was correctly assigned to the target LAN device.
  • Access from LAN to public IP of the teltonika: Success
  • Access from LAN to internet: Failed
  • Access from internet (mobile network) to public IP of the LAN device with the passthrough: Success
2

Hi,

Is your mobile network able to route to your LAN IP subnet? If yes then you can disable NAT(masquerade) and allow forwarding from WAN zone to LAN. E.g.:

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3

Hello @jvera,

Apologies for the delayed response.

Could you please confirm whether your issue has been resolved or if you still require any assistance?

Best regards,