NAT

The video demonstrates a method to interface IPv6 to IPv4 network using NAT-PT on Cisco router. We will cover the basic 1-to-1 static NAT, dynamic NAT, and PAT primarily translating IPv6 source IP to IPv4. We will then look at DNS ALG feature that helps rectifying an embedded IP as DNS reply crosses IPv4-IPv6 boundary, while analysing it by Wireshark. We will configure IPv4 Mapped NAT feature to automate destination NAT process by mapping the entire IPv4 address space to IPv6 /96 subnet. The lab finishes with modification of the NAT global timeout values.

The video demonstrates a method to interface IPv6 to IPv4 network using NAT-PT on Cisco router. We will cover the basic 1-to-1 static NAT, dynamic NAT, and PAT primarily translating IPv6 source IP to IPv4. We will then look at DNS ALG feature that helps rectifying an embedded IP as DNS reply crosses IPv4-IPv6 boundary, while analysing it by Wireshark. We will configure IPv4 Mapped NAT feature to automate destination NAT process by mapping the entire IPv4 address space to IPv6 /96 subnet. The lab finishes with modification of the NAT global timeout values.

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.

Topic includes