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2303The CD contains a multimedia demonstration of configuring PAT on a router
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Once you have configured address translation, you can use many different commands to verify and troubleshoot the operation of address translation on your router For instance, if you want to see the address translation table on your router, use the show ip nat translations command:
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Router# show ip nat Pro Inside global --- 2002002001 --- 2002002002 translations Inside local 19216811 19216812 Outside local ----Outside global -----
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In this example, two addresses are being translated: 19216811 (inside local) to 2002002001 (inside global) and 19216812 (inside local) to 2002002002
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(inside global) Notice that no protocol is listed (Pro) or port numbers, indicating that these are NAT translations, not PAT Here s an example of the show command with PAT translations in the translation table:
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Router# show ip nat translations Pro Inside global Inside local Outside local Outside global tcp 2002002001:1080 19216811:1080 201111:23 201111:23 tcp 2002002001:1081 19216812:1080 201111:23 201111:23
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In this example, both 19216811 and 19216812 are accessing the same outside device (201111) using telnet Notice that both also use the same source port number (1080 under the Inside local column) The IOS has noticed this and changed the second connection s source port number from 1080 to 1081 in order to differentiate the two connections
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2304The CD contains a multimedia demonstration of the show ip nat translations command on a router You can even see address translations statistics on your router with this command:
Router# show ip nat statistics Total translations: 2 (0 static, 2 dynamic; 0 extended) Outside interfaces: Serial0 Inside interfaces: Ethernet0 Hits: 98 Misses: 4 Expired translations: 1 Dynamic mappings: -- Inside Source access-list 1 pool nat-pool refcount 2 pool nat-pool: netmask 255255255255 start 20020020010 end 200200200254 type generic, total addresses 12, allocated 1 (9%), misses 0
In this example, there are currently two dynamic translations in the translation table Hits refers to the number of times the IOS looked into the translation table and found a match (an existing translation that can be used for the packet), while Misses indicates the number of times the IOS looked in the table for a translation, didn t find one, and had to create an entry in the translation table for the packet
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2305The CD contains a multimedia demonstration of the show ip nat statistics command on a router
23: Address Translation
For dynamic entries in the translation table, you can clear all of the entries, or specific entries, using the following commands:
Router# clear ip nat translation * Router# clear ip nat translation inside global_IP_address local_IP_address Router# clear ip nat translation outside global_IP_address local_IP_address Router# clear ip nat translation protocol inside global_IP_address global_port local_IP_address local_port
The first command clears all dynamic entries in the table Note that to clear static entries, you need to delete your static NAT configuration commands from within Configuration mode
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2306The CD contains a multimedia demonstration of the clear ip nat translation command on a router In addition to show commands, you can also use debug commands for troubleshooting The debug ip nat command, for instance, will show the translations the IOS is doing on every translated packet This is useful in determining whether the IOS is translating your packet and segment header addressing information correctly Please note that on a busy network, this command will require a lot of CPU cycles on your router
Use the show ip nat translations command to display the router s translations Use the clear ip nat translations command to clear
dynamic translations from the translation tableThe debug ip nat command shows the router performing address translation in a real-time fashion
Here s an example of the debug ip nat command:
Router# debug ip nat 05:32:23: NAT: s=192168110->2002002002, d=201111 [70] 05:32:23: NAT*: s=201111, d=2002002002->192168110 [70]
In the first line of this example, an internal machine (192168110), which is the source address in the packet (s=), is having its address translated to 2002002002 where the packet is being sent to the destination of 201111 (d=) The second line
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