STATIC and DYNAMIC NAT Configuration in TAMIL || Packet Tracer Labs || CCNA || Dinesh Kumar M
#STATICNAT#DYNAMICNAT#PacketTracerLabs
With static NAT, routers or firewalls translate one private IP address to one public IP address. Each private IP address is mapped to a single public IP address. This is the reason why this type of NAT is not used very often – it requires one public IP address for each private IP address.
Three steps are required to configure static NAT:
1. configure the router’s inside interface using the ip nat inside command
2. configure the router’s outside interface using the ip nat outside command
3. configure private/public IP address mapping using the ip nat inside source static PRIVATE_IP PUBLIC_IP command
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Dynamic NAT
Unlike with static NAT, where you had to manually define a static mapping between a private and a public address, dynamic NAT allows you to map a private IP address to an IP address from out of a pool of public IP addresses. The router will dynamically pick an unassigned address from the pool. The dynamic entry will stay in the NAT translations table as long as the traffic is exchanged. After a period of inactivity, the entry wll time out and the global IP address will be available for new translations.
With dynamic NAT, you specify two sets of addresses on your Cisco device:
the inside addresses that will be translated.
a pool of public IP addresses.
To configure dynamic NAT, the following commands are required:
1. configure the router’s inside interface using the ip nat inside command.
2. configure the router’s outside interface using the ip nat outside command.
3. configure an access list that has a list of the inside source addresses that should be translated.
4. configure the pool of global IP addresses using the ip nat pool NAME FIRST_IP LAST_IP netmask SUBNET_MASK command.
5. enable dynamic NAT with the ip nat inside source list ACL_NUMBER pool NAME global configuration command
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