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Here,we are going to see how to configure PAT with Dynamic NAT with Pool of IP address in packet tracer.


Go to this link and first do a Dynamic NAT with pool of IP address.'Click Here'.


The difference is just add this 'overload' at the end of the NAT command like this,


R1(config)#ip nat inside source list 10 pool publiciprange

                                               (to)

R1(config)#ip nat inside source list 10 pool publiciprange overload


        This command will force the router to use port number for translation.


Now,Click on PC->Desktop->command prompt->ping 30.0.0.10 and press 'enter'.Do this in all
5PC's immediately then only router use the ports from 1024-65,535 and go check router R1 to see
translation.i got this,




Translation in Router R1,


NAT: s=10.0.0.10->20.0.0.2, d=30.0.0.10 [1]

NAT: s=10.0.0.20->20.0.0.2, d=30.0.0.10 [1]

NAT: s=20.0.0.2, d=30.0.0.10->30.0.0.10 [1]

NAT: s=10.0.0.255->20.0.0.2, d=30.0.0.10 [1]

NAT: s=20.0.0.2, d=30.0.0.10->30.0.0.10 [1]

NAT: s=10.0.255.255->20.0.0.2, d=30.0.0.10 [1]

NAT: s=20.0.0.2, d=30.0.0.10->30.0.0.10 [1]

NAT: s=10.255.255.254->20.0.0.2, d=30.0.0.10 [1]

NAT: s=20.0.0.2, d=30.0.0.10->30.0.0.10 [1]

NAT: s=10.0.0.10->20.0.0.2, d=30.0.0.10 [2]

NAT: s=10.0.0.20->20.0.0.2, d=30.0.0.10 [2]



Router will wait 30 seconds after that translations will be expired and ip address will be available again


NAT: expiring 20.0.0.2 (10.0.0.10) icmp 1 (1)

NAT: expiring 20.0.0.2 (10.0.0.20) icmp 1024 (1)

NAT: expiring 20.0.0.2 (10.0.0.255) icmp 1025 (1)

NAT: expiring 20.0.0.2 (10.0.255.255) icmp 1026 (1)

NAT: expiring 20.0.0.2 (10.255.255.254) icmp 1027 (1)

NAT: expiring 20.0.0.2 (10.0.0.10) icmp 2 (2)

NAT: expiring 20.0.0.2 (10.0.0.20) icmp 1028 (2)

NAT: expiring 20.0.0.2 (10.0.0.255) icmp 1029 (2)

NAT: expiring 20.0.0.2 (10.0.255.255) icmp 1030 (2)

NAT: expiring 20.0.0.2 (10.255.255.254) icmp 1031 (2)

NAT: expiring 20.0.0.2 (10.0.0.10) icmp 3 (3)

NAT: expiring 20.0.0.2 (10.0.0.20) icmp 1032 (3)

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