Symmetric NAT

• applies restrictions exactly the same way as an Address Port Restricted Cone NAT but handles the NAT translation differently
• all types of NAT discussed so far don’t change the source port when NATing connections. For example, when a client accesses the Internet using IP 192.168.0.1 and source port 56723 NAT changes the source IP to say 56.35.67.35 but keeps the port number the same; this is known as port preservation. A Symmetric NAT however randomly generated ones new ports

Comparisons to Other NATs

see: Network Address Translation (NAT)

Subpages

• How Do You Know if You are Behind a Symmetric NAT？