NAT on the anchor ISA is required for forwarding of traffic to/from a DSM UE. There is no UE state in the IOM/IMM for a DSM UE. The downstream forwarding is based on FDB lookup that should match a route corresponding to the NAT outside pool and get the downstream traffic to the right anchor ISA, where NAT is performed for the UE. The inside IP address assigned to the UE is the configured l2-aware-ip-address on the vlan-range (default or specific range) under wlan-gw interface. Therefore every UE corresponding to the default or specific vlan-range gets the same inside IP@. The NAT is L2-aware and uses UE MAC to de-multiplex.