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RFC 1631 (rfc1631) - The IP Network Address Translator (NAT) (2712 words) |
 | Stub A's NAT is assigned the class C address 198.76.29.0, and Stub B's NAT is assigned the class C address 198.76.28.0. |
| When a NAT box x in stub partition X wishes to deliver a packet to stub partition Y, it will encapsulate the packet in an IP header with destination address set to the global address of NAT box y that has been reserved for encapsulation. |
| NAT has several negative characteristics that make it inappropriate as a long term solution, and may make it inappropriate even as a short term solution. |
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PF: Network Address Translation (NAT) (1777 words) |
| NAT is necessary when the number of IP addresses assigned to you by your Internet Service Provider is less than the total number of computers that you wish to provide Internet access for. |
| NAT allows you to take advantage of the reserved address blocks described in RFC 1918, "Address Allocation for Private Internets." Typically, your internal network will be setup to use one or more of these network blocks. |
| The NAT gateway will record the changes it makes in its state table so that it can a) reverse the changes on return packets and b) ensure that return packets are passed through the firewall and are not blocked. |
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