
Configuring Network Address Translation
303528-A Rev 00
12-5
NAT software detects a packet on a NAT interface that contains the address
10.0.0.15 (Figure 12-2
).
Figure 12-2. NAT Detects the Unregistered Source Address
NAT software dynamically translates the unregistered source address, 10.0.0.15,
to one of the available registered global addresses (in this case, 192.55.10.3) and
puts a new entry in the local/global translation entry list (Figure 12-3
).
NAT router
Local address
range list
Global address
range list
15.0.0.0 to 15.255.255.255
50.1.1.0 to 50.1.1.225
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
10.0.0.15 192.55.10.20
IP packet
Source address Destination address
IP0052A
10.0.0.0 to 10.255.255.255
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