How to configure dynamic nat in cisco router using packet tracer step by step guide

How To Configure Dynamic NAT in Cisco Router | In this article we will learn what is dynamic  nat , how to configure dynamic  nat and after configuring verify the dynamic  nat in cisco router using packet tracer software.

Suppose in an organization we have reserved private network (192.168.1.0/24) to use to communicate among the users. If all users want to access to the internet then dynamic nat plays an important role to fulfill this requirement.

Private ip address Range

Class A => 10.0.0.0  to 10.255.255.255

Class B => 172.16.0.0 to 172.31.255.255

Class C=> 192.168.0.0 to 192.168.255.255

 Type of NAT

Three types of nats are available.

•   Static nat
•   Dynamic nat
•   Natoverloading(PAT)

What is Dynamic NAT

In the dynamic nat router is configured a pool of ipv4 address . when user want to access to internet then node request to router to mapping public ip address to the corresponding private ipaddress. 

Lab Diagram

 

                           How to configure dynamic  nat in cisco router using packet tracer

In the above diagram we configure dynamic nat in cisco router using packet tracer software.

Configuration of dynamic nating

To configure dynamic nat below some steps we have to follow.

1. Create a pool of public ip addresses to the router to map the private ip addresses.
2. Create an access list to permit ip addresses which to be translated.
3. Map the pool to the access list.
4. Finally apply nat configuration  to the router interface.

In  the above diagram we have a private network 192.168.1.0/24 which to be mapped to public network which is 15.100.60.0/27. To configure it we follow the below steps.

Router(config)#ip nat pool mypool 15.100.60.3 15.100.60.30 netmask 255.255.255.0

Router(config)#ip access-list extended mypool

Router(config-ext-nacl)#permit ip 192.168.1.0 0.0.0.255 any

Router(config-ext-nacl)#exit

outer(config)#ip nat inside source list mypool pool mypool

Router(config)#int gig0/0

Router(config-if)#ip nat inside

Router(config-if)#exit

Router(config)#int se0/0/0

Router(config-if)#ip nat outside

Router(config-if)#exit

Router(config)#

verify of dynamic nating

After configuring dynamic nating we need to verify it. To verify it we execute the below command.

Router#sh ip nat statistics

Total translations: 0 (0 static, 0 dynamic, 0 extended)

Outside Interfaces: Serial0/0/0

Inside Interfaces: GigabitEthernet0/0

Hits: 0 Misses: 0

Expired translations: 0

Dynamic mappings:

-- Inside Source

access-list mypool pool mypool refCount 0

pool mypool: netmask 255.255.255.0

start 15.100.60.3 end 15.100.60.30

type generic, total addresses 28 , allocated 0 (0%), misses 0

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