Cisco 7609-S Configuration Guide - Page 338
Configuring Identity NAT, Configuring Static Identity NAT
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Bypassing NAT Chapter 16 Configuring NAT Configuring Identity NAT Identity NAT translates the real IP address to the same IP address. Only "translated" hosts can create NAT translations, and responding traffic is allowed back. Figure 16-24 shows a typical identity NAT scenario. Figure 16-24 Identity NAT FWSM 209.165.201.1 209.165.201.1 209.165.201.2 209.165.201.2 132935 Inside Outside Note If you change the NAT configuration, and you do not want to wait for existing translations to time out before the new NAT information is used, you can clear the translation table using the clear xlate command. However, clearing the translation table disconnects all current connections that use translations. To configure identity NAT, enter the following command: hostname(config)# nat (real_interface) 0 real_ip [mask [dns] [outside] [[tcp] tcp_max_conns [emb_limit]] [udp udp_max_conns] [norandomseq]] See the "Configuring Dynamic NAT or PAT" section on page 16-26 for information about the options. For example, to use identity NAT for the inside 10.1.1.0/24 network, enter the following command: hostname(config)# nat (inside) 0 10.1.1.0 255.255.255.0 Configuring Static Identity NAT Static identity NAT translates the real IP address to the same IP address. The translation is always active, and both "translated" and remote hosts can originate connections. Static identity NAT lets you use regular NAT or policy NAT. Policy NAT lets you identify the real and destination addresses when determining the real addresses to translate. (See the "Policy NAT" section on page 16-10 for more 16-34 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM OL-20748-01
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