
134 Chapter 8 Network Address Translation (NAT) Screens
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In Figure 35, B can send packets, with source IP address e.f.g.h and port 20202 to
A because A previously sent a packet to IP address e.f.g.h and port 20202. B
cannot send packets, with source IP address e.f.g.h and port 10101 to A because A
has not sent a packet to IP address e.f.g.h and port 10101.
Figure 35 Port Restricted Cone NAT
NAT application
Figure 36 illustrates a possible NAT application, where three inside LANs (logical
LANs using IP Alias) behind the Business Secure Router can communicate with
three distinct WAN networks. More examples follow at the end of this chapter.
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