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Inside Source Translation

Inside source translation is the most commonly used NAT configuration. When an inside host sends a packet to the outside network, the NAT router translates the source information (either the source address or the source address/port pair) and, in the inbound direction, restores the original information (this time operating on the destination address or address/port pair).

For outbound traffic, the NAT router translates the inside local address (or address/port) into the inside global address (or address/port), either through a statically defined translation or dynamically created translation. For inbound traffic, a translation must be found to revert the inside global address (or address/port) into the inside local address (or address/port), or the packet is not routed into the inside network.

Note: Dynamic inside source translations are established by outbound traffic.

You use inside source translation in traditional and bidirectional NAT configurations.

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