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Configuring Network Address Translation

305753-A Rev 00

3-5

When the router’s NAT interface receives a packet, the NAT router extracts the

source address, first checking whether the packet’s source address falls within a

configured local address range. If it does, NAT compares the source address

against existing address translation entries in an internal table. In Figure 3-2

, the

NAT router detects a packet on a NAT interface that contains the address

10.0.0.15.

Figure 3-2. NAT Detects the Source Address

If the inside host’s source address does not appear in the translation table and is

within a configured local address range, the NAT router does the following:

Creates a new entry for the host

Dynamically assigns the next available registered IP address from a global

address pool

Changes the source address of the packet to the registered address

NAT router

Local address

range list

Global address

range list

15.0.0.0 to 15.255.255.255

50.1.1.0 to 50.1.1.255

192.55.10.0 to 192.55.10.255

192.20.10.0 to 192.20.10.255

Current local/global

mapping entry list:

10.0.0.1 192.55.10.1

10.0.0.2 192.55.10.2

10.0.0.15 192.100.20.2

IP packet

Source address Destination address

IP0052A

10.0.0.0 to 10.255.255.255

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 179 180

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Avaya Configuring BFE Services Manual do Utilizador Página 49