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    NAPT

    Network address port translation (NAPT) is a mechanism that allows a private network to share a single external address. NAPT translates the transport identifier (for example, the TCP and UDP port numbers or the ICMP query ID) of the private network into a single external address. NAPT can be combined with Basic NAT to use a pool of external addresses in conjunction with port translation.

    For packets outbound from the private network, NAPT translates the source IP address, source transport identifier (TCP/UDP port or ICMP query ID) and related fields, such as IP, TCP, UDP and ICMP header checksums. For inbound packets, the destination IP address, destination transport identifier and the IP and transport header checksums are translated.

     

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    Published: 2012-07-02

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