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101

Configuring Network Address Translation

303528-A Rev 00

12-25

Configuring N-to-1 Address Translation

N-to-1 address translation -- also known as dynamic port translation -- allows you

to translate a range of local IP addresses on a private network into a single global

IP address.

N-to-1 translation is valid only for TCP/UDP packets. All non-TCP/UDP packets

with addresses that fall within the N-to-1 range are dropped.

With N-to-1 address translation enabled, you define a range of local addresses for

N-to-1 translation and specify a single N-to-1 global address. When NAT receives

a packet on the local interface, the following events occur:

1. NAT determines that the local source address falls within an N-to-1 range.

2. NAT assigns the N-to-1 global source address and a unique port number to the

packet.

3. NAT transmits the packet on the global interface.

In Figure 12-5

, for example, the network administrator has set up an N-to-1 local

address range of 55.0.0.0 to 55.255.255.255 and associated this range of local

addresses with global IP address 192.1.1.1. The following events occur:

1. NAT receives a packet from host A on the local interface with a local source

address of 55.0.0.1 and a port number of 2001.

2. Determining that the local source address falls within an N-to-1 range, NAT

stores the port number, replaces the local source address with the global

address 192.1.1.1, assigns a new unique port number X12Y, and transmits the

packet on the global interface.

3. Subsequently NAT receives a packet from host B on the local interface with

local source address 55.0.0.2 and port number 2222. Determining that this

local source address falls in the same N-to-1 range, NAT replaces the local

source address with the global address 192.1.1.1, assigns unique port number

X54Y, and transmits the packet on the global interface.

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