pbxnsip - What is NAT

What is NAT?

Network Address translation (NAT) is the translation of an Internet Protocol address (IP address) between networks. One network is designated the inside network and the other is the outside. Typically, a company maps its local inside network address to a global outside (public) IP addresses. NAT unmaps the global IP addresses on incoming packets back into local IP addresses. This helps ensure security. It can also cause severe headaches without a NAT filter or session border controller.


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