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Cisco ASA Series Firewall ASDM Configuration Guide
Chapter 3 Information About NAT (ASA 8.3 and Later)
How NAT is Implemented
Figure 3-15 shows the use of source and destination ports. The host on the 10.1.2.0/24 network accesses
a single host for both web services and Telnet services. When the host accesses the server for web
services, the real address is translated to 209.165.202.129. When the host accesses the same server for
Telnet services, the real address is translated to 209.165.202.130.
Figure 3-15 Twice NAT with Different Destination Ports
Web and Telnet server:
209.165.201.11
Internet
Inside
Translation
209.165.202.12910.1.2.27:80
10.1.2.27
10.1.2.0/24
Translation
209.165.202.13010.1.2.27:23
Web Packet
Dest. Address:
209.165.201.11:80
Telnet Packet
Dest. Address:
209.165.201.11:23
130040