NAT

The video combines the knowledge from our two previous videos on Object NAT and Twice NAT, and provides some guidelines on how to use them together on a single NAT table. We also discuss about pre-8.3 migration strategies and how the legacy command syntax (eg. nat, global, static, access-list) can be mapped to the new. We finish off the video with an experiment on the placement of destination NAT statement on the NAT table, and note its significance. We hope that you will have a better understanding on ASA 8.3 NAT by the end of this video.

The video looks at how to configure Twice NAT on a Cisco ASA 8.3. We go through NAT configuration syntax for different type of NAT scenarios and examine some characteristics specific to Twice NAT.

The video looks at how to configure Object NAT on a Cisco ASA 8.3. We go through NAT configuration syntax for different type of NAT scenarios and examine some characteristics specific to Object NAT.

The video discusses how NAT affects embedded IP in an application payload as the packet passes through a Cisco NAT router. Two widely used applications: DNS and FTP, are chosen for our demonstration. We go into great detail to analyze FTP protocol behavior using both passive and active mode. Lastly, we look at how a router cope with non-standard FTP port. Wireshark captures are reviewed throughout this video.

• Application-Level NAT (ip nat service)

The video picks up where we left off on the Basic NAT video. The more advanced NAT functionalities on Cisco router are demonstrated.

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.

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