Cisco 7604 Configuration Guide - Page 333
Using Static NAT
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Chapter 16 Configuring NAT Using Static NAT To identify a single real address with two different destination addresses using policy NAT, enter the following commands. (See Figure 16-9 on page 16-11 for a related figure.) hostname(config)# access-list NET1 permit ip 10.1.2.0 255.255.255.0 209.165.201.0 255.255.255.224 hostname(config)# access-list NET2 permit ip 10.1.2.0 255.255.255.0 209.165.200.224 255.255.255.224 hostname(config)# nat (inside) 1 access-list NET1 tcp 0 2000 udp 10000 hostname(config)# global (outside) 1 209.165.202.129 hostname(config)# nat (inside) 2 access-list NET2 tcp 1000 500 udp 2000 hostname(config)# global (outside) 2 209.165.202.130 To identify a single real address/destination address pair that use different ports using policy NAT, enter the following commands. (See Figure 16-10 on page 16-12 for a related figure.) hostname(config)# access-list WEB permit tcp 10.1.2.0 255.255.255.0 209.165.201.11 255.255.255.255 eq 80 hostname(config)# access-list TELNET permit tcp 10.1.2.0 255.255.255.0 209.165.201.11 255.255.255.255 eq 23 hostname(config)# nat (inside) 1 access-list WEB hostname(config)# global (outside) 1 209.165.202.129 hostname(config)# nat (inside) 2 access-list TELNET hostname(config)# global (outside) 2 209.165.202.130 Note FWSM and ASA behave differently when you configure dynamic NAT without the global keyword. On FWSM, an identity xlate is created, and the packet is forwarded. On the ASA, no xlate is created, and the packet is dropped due to the missing global keyword. In the following example, a packet sourced from 10.1.1.0/24 with a destination behind the outside interface is forwarded on the FWSM but dropped on the ASA: hostname(config)# nat (inside) 1 10.1.1.0 255.255.255.0 without global (outside) 1 X To avoid this situation, configure NAT exemption (nat 0), or specify the global keyword. Using Static NAT This section describes how to configure a static translation. Figure 16-22 shows a typical static NAT scenario. The translation is always active so both translated and remote hosts can originate connections, and the mapped address is statically assigned by the static command. Figure 16-22 Static NAT FWSM 10.1.1.1 209.165.201.1 10.1.1.2 209.165.201.2 132937 Inside Outside OL-20748-01 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM 16-29
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