carrier grade NAT (IPv6) (CGN)

Carrier-gradeNAT (CGN) is an addressing method for IP addresses, where carrier-grade refers to the Internet Service Provider( ISP) that assigns private IPv4 address to customers.

The NAT method, Network Address Translation (NAT), was introduced before the introduction of IPv6 addresses to bypass bottlenecks in the allocation of IPv4 addresses.

Carrier grade NAT is all about saving public IP addresses. For this reason, the provider assigns the end customer an IPv4 address from its private address range, thus saving public IPv4 addresses. The CGN method is characterized by several address translations. The network address of the home network, which is transferred to the private network address of the provider and from there to the public IP address of the Internet.