Configuration of the Network-Modules' External Interface
On most network-module, there is an additional External Interface. This External Interface is located on the faceplate of the Network-Module and provides a RJ-45 connector.
This interface can only be used (and therefore configured) by the Network-Module; the ISR does not see this interface. This external interface can be use to connect the Network-Module to a different network.
The configuration of the interface (eth1) is done similarly to any other IOS Modern Ethernet Interface.
First, get to the Network-Module's console in configuration mode and enter the eth1 interface submode.
Router#service-module integrated-Service-Engine 1/0
session network-module> configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
network-module(config)> interface eth1
network-module(config-interface)> ip address 10.10.0.24 255.255.255.0
network-module(config-interface)> no shutdown
After the configuration of the external interface, make sure that the network is connected and that you configure additional ip route if required.