Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?

 

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.

Benefits

  • 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