Change Port 2 from LAN to WAN for dual-wired-WAN

Difficulty level: intermediate

Goal

 To change the functionality of the 633x-MX router's port #2 from part of the LAN to be a WAN internet connection.

Setup

This article assumes the 633x-MX router is operating under default settings, which provide DHCP connectivity to devices connected ports 1 and 2 of the 633x-MX.  For more details on the default settings of the 633x-MX, see the Default Settings section of the 6330-MX User's Manual.  Also, refer to the Getting started with Accelerated View for details on how to configure a 6330-MX (or the Local device management section, if you are managing the device without Accelerated View).

Configuration Steps

Open the configuration profile for the 6330-MX and make the following changes.  

  1. Under Network -> Interfaces , create a new interface called WAN2 

  2. Set Network -> Interfaces -> WAN2 -> Zone to External

  3. Set Network -> Interfaces -> WAN2 -> Device to Ethernet: LAN2

  4. Under the new Network -> Interfaces -> WAN2  -> IPv4 section, make the following changes:

    1. If a static IP address is needed for Internet connectivity on this port, enter in the static address and subnet in the Address field, and enter in the gateway for the static IP in the Default gateway field.  If a static IP address is not necessary, which it typically is not, change Type to DHCP address

    2. Change Metric to 2.  This will setup port #2 of the 6330-MX to act as the backup wired-WAN Internet connection.  The WAN port of the 6330-MX will remain the primary Internet connection.

    3. Optional: setup failover  or load balancing on the new WAN2 interface.  See failover article here  and load-balancing article here for reference, substituting the cellular modem for the WAN2 interface.

  5. Under Network -> Bridges -> LAN -> Devices, click the down-arrow next to Device Ethernet: LAN2 and select Delete to remove port #2 from the LAN of the 6330-MX.

  6. Save the configuration.