
Configuring Network Address Translation
117356-A Rev. A 12-5
NAT software detects a packet on a NAT interface that contains the address
10.0.0.15 (F
igure 12-2).
Figure 12-2. NAT Detects the Unregistered Source Address
NAT software dynamically maps 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 mapping entry list (F
igure 12-3).
NAT Router
Local address
range list
Global address
range list
15.0.0.20 to 15.0.0.80
50.1.1.40 to 50.1.1.225
192.55.10.1 to 192.55.10.5
192.10.10. to 192.10.10.20
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
10.0.0.1 to 10.255.255.255
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