Basic NAT: portmaps

• map = "map" ifname fromto "->" ipmaks [mapport]

• mapport = "portmap" tcpudp portrange

• portrange = nr":"nr | "auto"

• tcpudp = "tcp" | "udp" | "tcp/udp"

• ports are allocated like ip addresses: first come first serve

• "auto" uses ports ³ 1024. It uses a fixed algorithm to calculate port number mappings