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Address Translation Con guration
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when building the appropriate translation in the translation table For instance, Cisco routers with the IOS firewall feature set and PIX and ASA security appliances support a fix-up process that covers many of these application issues, including embedded addressing information However, if your product doesn t support this feature, you ll need to disable address translation for the affected devices
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Address Translation Configuration
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The configuration of the different types of address translation, such as NAT and PAT, is very similar The following sections cover the configuration and verification of some of the types of address translation discussed so far Even though Cisco routers support address translation capabilities, by far the address translation features of the ASA and PIX security appliances provide more granularity and flexibility in implementing your address translation policies than do Cisco routers For more complex address translation policy configurations on Cisco routers, read my book with Cisco Press, Cisco Router Firewall Security (ISBN: 1587051753) For information on configuring address translation on PIXs and ASAs, read my book with McGraw-Hill, Cisco PIX Firewalls (ISBN: 0072225238)
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NAT Con guration
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As mentioned, the two types of NAT are static and dynamic The configuration process is similar for both types Probably the most difficult process of configuring address translation is understanding the difference between the terms inside and outside These terms refer to where your devices are located (inside) and where the external network (the Internet, for instance) is (outside) This is important when it comes to the configuration of address translation In the IOS, you must perform two basic configuration steps:
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Define the address translation type (Global Configuration mode commands) Define the location of devices (Interface Subconfiguration mode commands)
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The following sections cover the configuration of both static and dynamic NAT
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23: Address Translation
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Configuring Static NAT
As mentioned earlier, static NAT is typically used when devices on the outside of your network want to access resources, such as web, DNS, and e-mail servers, on the inside Here are the two commands used to define the static translations for NAT:
Router(config)# ip nat inside source static inside_local_source_IP_address inside_global_source_IP_address Router(config)# ip nat outside source static outside_global_destination_IP_address outside_local_destination_IP_address
The inside and outside parameters specify the direction in which translation will occur For instance, the inside keyword specifies that the inside source local IP addresses are translated to an inside global IP address when leaving the network; and the destination global IP addresses are translated to inside local IP addresses when entering your Remember how to create network The outside keyword changes a one-to-one static translation with the the outside destination global IP address to an ip nat inside|outside source outside local address (the latter command is static command used when you are connecting two company networks together and their addresses overlap) After you configure your translations, you must specify which interfaces on your router are considered to be on the inside and which are on the outside This is done with the following configuration:
Router(config)# interface type [slot_#/]port_# Router(config-if)# ip nat inside|outside
Specify inside for interfaces connected to the inside of your network and outside for interfaces connected to external networks, such as your ISP Let s take a look a simple static NAT example I ll use the network shown in Figure 23-3 for this example In this example, an internal web server (19216811) will
Use the ip nat inside|outside Interface Subcon guration mode command to
specify which interfaces are considered inside and which are outside
Address Translation Con guration
FIGURE 23-3
Web server 19216811
Network translation example
Internal network
Internet
PC-A 192168110
PC-B 192168111
Src IP = 199101725 Dst IP = 19216811 Src IP = 199101725 Dst IP = 2002002001
be assigned a global IP address of 2002002001 Here s the router s configuration to accomplish this static translation:
Router(config)# ip nat inside source static 19216811 2002002001 Router(config)# interface ethernet 0 Router(config-if)# ip nat inside Router(config-if)# exit Router(config)# interface serial 0 Router(config-if)# ip nat outside
The ip nat inside source static command defines the translation The ip nat inside and outside commands specify what interfaces are on the inside (E0) and what interfaces are on the outside (S0) Note that any packets that don t match the address translation rule will pass between these two interfaces untranslated If you want only translated packets to pass between these interfaces, you ll need to configure an appropriate ACL or ACLs
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