Carrier-grade NAT (CGN orCGNAT), also known as large-scale NAT (LSN), is a type ofnetworkaddress translation (NAT) used by Internet service providers (ISPs) in IPv4networkdesign.
CGNATstands for Carrier-GradeNetworkAddress Translation, and it’s an important technology that many internet service providers (ISPs), including Superloop, use to manage IP addresses.
The reason is that your ISP placed you behind Carrier Grade NAT (CGNAT), a layer ofnetworkaddress translation that happens before your router and that you cannot configure or bypass using your own equipment.
WhatCGNATActually Is (Simple Explanation). Normally: Your ISP gives you a public IP address. When you port forward on your router, the internet can reach your devices directly.WithCGNAT: Your ISP puts you behind another layer of NAT before you even reach the internet.
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(2) Provider’s PrivateNetwork:CGNATin action! The CPE forwards the outgoing traffic to the ISP’snetwork, where theCGNATserver is. TheCGNATperforms the second NAT using the reserved IP address space (RFC6598) 100.64.0.0/10.
