Dynamic NAT

Dynamic NAT

Dynamic NAT is a technique in which multiple public Internet Protocol (IP) addresses are mapped and used with an internal or private IP address.Dynamic NAT translates a group of real addresses to a pool of mapped addresses that are routable on the destination network.

With dynamic NAT, you specify two sets of addresses on your Cisco router:
1. inside addresses that will be translated
2. a pool of global addresses
Unlike with static NAT, where you had to manually define a static mapping between a private and a public address, with dynamic NAT the mapping of a local address to a global address happens dynamically. This means that the router dynamically picks an address from the global address pool that is not currently assigned. It can be any address from the pool of global addresses. The dynamic entry stays in the NAT translations table as long as the traffic is exchanged. The entry times out after a period of inactivity and the global IP address can be used for new translations.
Lab Configuration Of Dynamic NAT


Router#conf t

Enter configuration commands, one per line. End with CNTL/Z.

Router(config)#int se 0/0/0

Router(config-if)#ip address

Router(config-if)#no sh


Router(config)#int fa 0/0

Router(config-if)#ip add

Router(config-if)#no sh

Applying DHCP

Router(config-if)#ip dhcp pool sachtech




Applying EIGRP


Router(config-router)#router eigrp 10



now after doing using protocol lets check our connectivity


the message are being passing, now lets how the another network understand the network address

Router#debug ip icmp

ICMP packet debugging is on

by using this command we can check the source ip address from where packets are coming


lets implement dynamic NAT now and see the result

Router(config)#ip access-list standard 10

Router(config-std-nacl)#permit any



Router(config)#ip nat pool test netmask

Router(config)#ip nat inside source list 10 pool test

Router(config)#int se 0/0/0

Router(config-if)#ip nat outside

Router(config-if)#int fa 0/0

Router(config-if)#ip nat inside

now lets check the result
all the local area pc ip get converted into public ip

57 thoughts on “Dynamic NAT

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