
Configuring IP Services
12-6
303528-A Rev 00
Figure 12-3. NAT Updates the Local/Global Translation Entry List
NAT software also replaces the unregistered local source address (10.0.0.15) with
the translated global address (192.55.10.3) and sends the packet on its way to its
destination in company B’s network (Figure 12-4
).
NAT router
Local address
range list
Global address
range list
Current local/global
mapping entry list:
10.0.0.1 192.55.10.1
10.0.0.2 192.55.10.2
10.0.0.15 192.55.10.3
10.0.0.15
IP packet
Source address Destination address
IP0053A
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
192.55.10.20
10.0.0.0 to 10.255.255.255
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