LTE7490 M904 won't connect to WAN on Router

Hi @fezuk,

It sounds like you're experiencing some connectivity challenges between your Zyxel LTE7490-M904 and your WAN router. Let's work through this.

The Zyxel LTE7490-M904 can operate in two primary modes: Router Mode and IP Passthrough Mode. Understanding which mode to use is crucial for your setup.

• Router Mode: In this mode, the LTE7490 acts as a router itself, performing NAT (Network Address Translation) and managing its own local network.
• IP Passthrough Mode: In IP Passthrough mode (also referred to as Bridge Mode), the LTE7490 passes its public IP address directly to a connected device, such as your WAN router. This essentially makes the LTE7490 function like a modem, with your WAN router handling all routing functions.

Based on your goal to have your WAN router "talking" to the LTE7490, IP Passthrough Mode is generally the recommended configuration. In this mode, the LTE7490 bypasses its own NAT function and forwards the public IP address directly to the device connected to its LAN port, which should be your WAN router.

Here are some steps to consider:

• Enable IP Passthrough Mode on the LTE7490-M904:

  1. Log in to the local web GUI of your LTE7490.
  2. Navigate to Broadband > Cellular APN.
  3. Click the Modify button for the enabled APN.
  4. Enable the IP Passthrough Mode feature.
  5. Click OK or Apply.
  • Note: The default setting for outdoor mobile routers like the LTE7490 is often IP Passthrough Mode with a Dynamic method.

• Connect LTE7490 to WAN Router: Ensure that the LAN port of your LTE7490 is connected to the WAN port of your WAN router.

• WAN Router Configuration: Your WAN router should be configured to obtain an IP address automatically via DHCP on its WAN interface. Since the LTE7490 in IP Passthrough mode will forward the public IP, your WAN router should receive it.
• DHCP Server on LTE7490: When in IP Passthrough mode, the LTE7490's DHCP server should be disabled if you want your WAN router to be the primary DHCP server. If the LTE7490's DHCP is active and hands out IP addresses, it can lead to conflicts.

To help us further diagnose the issue, please provide the following information:

• Current Mode: Confirm if the LTE7490 is currently set to Router Mode or IP Passthrough Mode (Dynamic or Fixed).
• WAN Router's WAN IP: What IP address is your WAN router receiving on its WAN interface when connected to the LTE7490?
• Network Topology: A simple diagram showing how the LTE7490, your WAN router, and any other devices are connected.
• LTE7490 Firmware Version: The firmware version shown in your screenshots is V1.00(ABQY.9)C0, please confirm if this is still the current version.

We are here to help you resolve this.