Creating Static Outside Source Translations

Less commonly used, outside source translation enables you to set up translation between two non-unique or not publicly routable networks (for example, two separate networks that use overlapping IP address blocks).

ip nat outside source static

• Use to translate the source address when routing a packet from the outside network to the inside network, and to untranslate the destination address when a packet travels from the inside network to the outside network.
• Creates a simple (IP address only) or extended (IP address, protocol, and port) entry in the translation table that maps the two addresses.
• A static translation created with the ip nat outside source static command enables any inside host to contact the outside host by using the outside local address of the outside host. A static translation can be used by traffic that is initiated in either direction.
• Example 1—Simple address translation

  host (config) # ip nat outside source static 171.69.68.10 10.1.2.3

• Example 2—Extended address/port translation

  host (config) # ip nat outside source static tcp 171.69.68.10 56 10.1.2.3 24

• Use the no version to remove the static translation and purge the associated translations from the translation table.
• See ip nat outside source static.

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