IP Passthrough allows you to assign a public IP address to a device connected to your Cisco modem, effectively bypassing Cisco's internal router.

You might want to bypass your router if you are a business customer wanting to connect 3rd-party equipment to Shaw equipment, or an advanced user who needs a Public IP address for specific devices.

Setup instructions

To use IP Passthrough, you'll need to ensure that you have a second dynamic IP address available for your modem. The automatic availability of multiple dynamic addresses depends on your Shaw Internet service package. Contact Shaw customer support to confirm the availability of a second IP address, then follow the setup instructions outlined below.

Before you plug in your 3rd party router, follow these instructions:

  1. Enter the Gateway IP "" in your web browser's address bar.
  2. Enter your username and password.
    • Default Username: cusadmin
    • Default Password: the serial number printed on your modem
  3. Click the Applications & Gaming tab.
  4. Click the IP Pass-through tab.



If the 3rd party device is connected prior to setting up IP Passthrough then you may be required to power cycle your equipment to complete the process. IP Passthrough on the Cisco DPC3848V can only be set by MAC Address. This allows you to specify the mac address of the specific device on your local network that should receive the public IP (generally a router connected via an Ethernet cable).

You will need to specify the MAC address of the relevant device network interface, which can be hooked up to an Ethernet port or by Wireless connection.

  1. Select the Enabled checkbox.
  2. Enter the MAC address of the network interface (see instructions below) you want related to the public IP.
  3. Click Add184544_cisco-ip-passthrough-enabled


  4. Verify that the Mac address appears in the list box.
  5. Click Save Settings.

IP Passthrough Verification

To verify that IP Passthrough is functioning, you need to check if the current device (with relevant MAC interface) received a public IP. This can be verified in the Network Connection Status Properties.



If the network interface status in the OS doesn't update (ie. still shows as then the status needs to be refreshed. Your options for doing this are any one of the following:

  • Renew the IP status by disabling and enabling the network interface
  • Disconnect and reconnect the Ethernet cable or wireless connection
  • Restart the modem by:
    • power cycling the modem
    • on the Gateway page (, log in, go to the Administration tab, and click Device Reset. Enter the password, then click Device Reset operation.

How to view the MAC address of your network interface

To view the MAC address of your network interface:

  1. Open the Network Connection window.
  2. Double-click the relevant network interface.
  3. Under Connection, click Details.
  4. Look under Physical Address for the MAC address.



Only defined devices will receive a Public IP. All other devices connected to the Cisco DPC3848V will continue to receive local IP.

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