RS0012 - Basic NAT

The video demonstrates various Network Address Translation (NAT) functionalities on Cisco router. We look at  scenarios when the NAT IP is assigned from the router interface subnet, where proxy-arp is utilized, and the IP is assigned from a completely different subnet.

Topic includes

• Static NAT
• Dynamic NAT
• Port Address Translation (PAT)
• Conditional NAT
• Proxy-ARP

• Static NAT is commonly used to expose services (eg. on servers) to outside (ACL is recommended to restrict access)
• Dynamic NAT is commonly used for end-users to access outside resources when PAT may break particular applications
• PAT is commonly used when only unidirectional access is needed and to hide inside hosts as well as to minimize IP usage
• Conditional NAT is commonly used when a host need to translated to different IPs under different connection (eg. interface being used, destination IP subnet etc.)