Modern NAT, including Carrier Grade NAT (CGNAT), complicates tracking by hiding multiple devices behind one IP, akin to a circus full of clowns. This anonymity facilitates spamming and malware distribution. ISPs can mitigate this by clarifying CGNAT usage and filtering outbound port 25, reducing support costs and spam.

*** This is a Security Bloggers Network syndicated blog from The Spamhaus Project authored by The Spamhaus Team. Read the original post at: https://www.spamhaus.org/resource-hub/network-security/the-conundrum-that-is-the-modern-use-of-nat-at-a-carrier-grade-level