By default, when a packet exits the WAN interface of the FatPipe, the FatPipe will apply a source NAT. The source IP will be changed to the IP of the WAN interface the packet exits. This is to maintain symmetrical routing. If it is wanted, packets can exit the Primary WAN without a NAT being applied. This is controlled in the outbound policy section of the GUI. A primary WAN is defined as the WAN interface that shares the same network as the LAN/external interface of the Firewall.