Avaya Configuring IP Services Bedienungsanleitung PDF herunterladen (Seite 428)

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Configuring IP Services

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Figure 12-5. N-to-1 Address Translation (Local to Global)

When NAT receives a packet from a remote source on the global interface, the

following events occur:

1. NAT determines that the destination address on the packet is a global N-to-1

address.

2. NAT uses the address and the port number to identify the destination host.

3. NAT attaches the local IP address to the packet and transmits it on the local

interface.

In Figure 12-6

, for example, the following events occur:

1. NAT receives a packet on the global interface with the destination address

192.1.1.1 and port number X12Y.

2. 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 A. NAT

attaches the local address to the packet and transmits the packet on the local

interface.

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

destination address 192.1.1.1 and port number X54Y.

IP0075A

NAT

N-to-1 translator

NAT

N-to-1 translator

Global interface

Local interface

Global source address: 192.1.1.1

Port: X12Y

Local source address: 55.0.0.1

Port: 2001

Global source address: 192.1.1.1

Port: X54Y

Local source address: 55.0.0.2

Port: 2222

Host A Host B

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