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CGNAT frustrates all IP address-based technologies (2019)
IPv4 is creaking at the seams
CGNAT's technical name – NAT444 – alludes to how the technology works: as with traditional NAT (NAT44), the end user is assigned a non-routable address from the private series defined in RFC 1918. As well as restricting applications by making users unreachable from the internet – with the result that peer-to-peer connections are hard to establish [ 1, 2], – CGNAT creates security problems. Similar "resolution problems" affect the entire spectrum of systems for blacklisting/whitelisting and reputation management, because almost all such tools use the IP address as the primary identifier.
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