
Configuring IP Services
12-6 117356-A Rev. A
Figure 12-3. NAT Updates the Local/Global Mapping Entry List
NAT software also replaces the unregistered local source address (10.0.0.15) with
the mapped global address (192.55.10.3) and sends the packet on its way to its
destination in Company B’s network (as shown in F
igure 12-4).
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
10.0.0.15 192.55.10.3
10.0.0.15 192.100.20.2
IP packet
Source address Destination address
IP0053A
10.0.0.1 to 10.255.255.255
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