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NCOS: How to Configure IP Passthrough on a capable Cradlepoint router

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NCOS: How to Configure IP Passthrough on a capable Cradlepoint router

Products Supported: AER31x0, AER2100, AER16x0, MBR1400, IBR11x0, IBR6x0, IBR6x0B, CBA850, CBA750B. Click here to identify your router.

NCOS Version: 6.0 - for information on upgrading NCOS Versions, click here.

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This article describes how to configure IP Passthrough (Bridge Mode) on a capable Series 3 Cradlepoint router.


Configuration Difficulty: Novice

Things to know before getting started: - When IP Passthrough is enabled, the first device connected to the router receives the modems public IP address. This means that any OTHER devices connected to the router will not be able to access the internet. IP Passthrough cannot be used in conjunction with port forwarding or NAT rules.

There are two ways to configure IP Passtthrough.

  • Step 1: Log into the router's NCOS Page. For help with logging in please click here.

  • Step 2.1: (Option 1) Select System then Setup Wizards from the left menu. The IP Passthrough Setup wizard will automatically apply the settings for enabling IP Passthrough.
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  • Step 2.2: (Option 2) Configure IPPT manually. Select Networking then Local Networks then Local IP Networks from the left menu.
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  • Step 3: Select Primary LAN then select Edit.
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  • Step 4: (This step is only necessary for WiFi capable products) Select Interfaces tab. Under Selected Interfaces move all WiFi interfaces to Available Interfaces using the arrows between.
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Note: A LAN in IPPT mode cannot have WiFi Interfaces attached to it

  • Step 5: Select IPv4 Settings tab and change the IPv4 Routing Mode to IP Passthrough.
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  • Step 6: Select Save.

  • Step 7: Verify that the Internet is still available on the connected computer.

  • Step 8: Verify that the IP address is same as the modems IP.


  • If the connected computer is receiving the passthrough address but IPPT connection fails when the Cradlepoint is plugged into a different device, consider the following:

    • Often, IP Passthrough requires a MAC address bound to it in order to work properly. To do this, return to the screen presented on step 4 then re-perform step 5. In the Passthrough Reservation field, enter the MAC Address of the desired device to configure IP Passthrough Reservation
    • Select Save.
  • If IP Passthrough works (device behind router receives the modems IP address) but you are unable to open ports, consider the following:

    • Many 4G networks assign private, double-NAT'd private IP addresses. Often these IP addresses start with 10.x.x.x. If you have this type of IP address, no port forwarding or remote access will be possible due to the cellular carrier's network configuration. This is not a limitation imposed by the Cradlepoint router.
    • In IPPT mode the device is not performing any routing, so it is very likely that the cellular carrier is blocking ports.
    • If the Cradlepoint router is unable to acquire a connection through the modem it will automatically issue your device a DHCP IP address. This can also occur if the router detects the computer connected BEFORE it connects to the modem. Performing an IP refresh/renew on your device will typically resolve this error.

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Published Date: 07/18/2017

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