Cisco NAT for IPv4

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Port Forwarding

Port forwarding is a static NAT translation with a specified TCP or UDP port number.

ip nat inside source {static {tcp | udp} local-ip local-port global-ip global-port} [extendable]
interface s0/0/0
  ip nat outside
interface fa0/0
  ip nat inside

extendable - option applied automatically, allows the user to configure several ambiguous static translations, where ambiguous translations are translations with the same local or global address. It allows the router to extend the translations to more than one port if necessary

References

more in Cisco_weird_interfaces#NVI_-_NAT_Virtual_Interface

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