The Gateway Node in WiFi Offload Gateway Node test case provides configuration to test WAN Node. You can emulate multiple nodes with the Number of Nodes setting1.
With an Ethernet User Node, you can define:
The IP address and routing options... The IP Address (IPv4 or IPv6) will increment for each node.
The MAC Address to override the Hardware MAC address so the packets sent out of the interface will use the provisioned MAC address rather the Hardware MAC Address.
Custom port selection... and error injection with the Advanced... button.
The Outbound Traffic Port to disable the normal routing function and to force packets out of the selected interface.
1 Maximum rates, number of sessions, and number of emulated nodes vary depending on the test configuration and the test system's licensed capacity.