Twice NAPT Overview
Twice NAPT translates both the source and destination IP addresses.
The private source address is translated by dynamically assigning a public address from a pool and a port number. Multiple private IP addresses can be mapped to the same external address because each private address is mapped to a different port of the external address.
The destination address is translated to the IPv4 address of a private server. This redirects traffic destined to a virtual host (identified by the original destination IP address) to the real host (identified by the translated destination IP address). The destination addresses is translated with a one-to-one static mapping to an address in a pool. Port mapping is not performed for the destination address.
You can also statically translate the destination port by using port forwarding. See Port Forwarding for Next Gen Services.
Allows hosts in the private network to connect with the external domain, while hiding the private network.
Minimizes the number of public IP addresses that are allocated for NAT.
Allows external traffic to communicate with a private host without revealing the host’s private IP address