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Caution: Although NAT is the simplest translation method, it is the least secure. By not including port or external host information in the translation, basic NAT allows access to any port of the private host by any external host. |
Basic NAT provides translation for IP addresses only (called a simple translation) and places the mapping into a NAT table. In other words, for packets outbound from the private network, the NAT router translates the source IP address and related fields (for example, IP, TCP, UDP, and ICMP header checksums). For inbound packets, the NAT router translates the destination IP address (and related checksums) for entries that it finds in its translation table.
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Caution: Although NAT is the simplest translation method, it is the least secure. By not including port or external host information in the translation, basic NAT allows access to any port of the private host by any external host. |
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