Avaya 3.7 Manuel D’Utilisation

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Provide support for multi-gateway network configurations. Address mapping can be 
used to ensure that request and reply packets enter and exit the network through the same 
security gateway.

shows an example of using NAT to allow hosts on a private non-routable or 

non-registered network to access the Internet.

The above example can be used for the following three applications described in the previous 
section, 

:

●

Allow access to the Internet from private networks

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Provide support for more hosts with fewer public addresses

●

Hide host addresses for security reasons

This configuration allows up to 254 private addresses from the 10.0.0.0/8 network to be 
dynamically mapped to public addresses from the N

1

.N

2

.N

3

.0/24 network.

Each NAT mapping is assigned to an interface. The rules for applying address translations to a 
packet entering or leaving an interface are:

●

When a packet is routed out on an interface (away from the security gateway), the source 
address of the packet is modified.

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Conversely, when a packet comes in on an interface (toward the security gateway), the 
destination address of the packet is modified.