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Configuring Network Address Translation

305753-A Rev 00

3-55

Figure 3-7. N-to-1 Translation (Global to Local)

3. Subsequently, NAT receives a packet on the global interface with the

destination address 192.1.1.1 and port number 54000. Determining that the

destination address is an N-to-1 address, NAT uses the address and the port

number to locate the destination host, host B. NAT replaces the global

destination address and TCP port number with the local address and port

number and transmits the packet on the local interface.

IP0076A

NAT

N-to-1 translator

Global destination address: 192.1.1.1

Port: 12000

Local destination address:55.0.0.1

Port: 2001

Global source address: 192.1.1.1

Port: 54000

Local source address: 55.0.0.2

Port: 2222

Host A Host B

NAT

N-to-1 translator

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