Question

What distinguishes PAT from static NAT?

Please explain clearly and better with a comparison chart.

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Answer 1

Static NETWORK ADDRESS TRANSLATION (static NAT)

So in NAT the private IP address or local address are translated into the public IP address. Static NAT is a type of NAT. In static NAT we map a single private IP address to single Public IP address. A translation of private IP address to a public IP address takes place.

Port Address Translation (PAT)

Private IP addresses are translated using port numbers into public IP address. PAT maps multiple source local addresses to single global IP address. It is similar to port forwarding but incoming packet with destination port is translated to a packet’s different destination port. I.e. external port is translated to an internal port.