How do you make sure that the single IPv4 address you are blocking is not used f... | Hacker News

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ju-st on Aug 27, 2021 | parent | context | favorite | on: IPv4 vs. IPv6 FAQ

How do you make sure that the single IPv4 address you are blocking is not used for CGNAT? When you don't care about collateral damage you could as well block IPv6 /40 or /48s. Currently this is maybe not a problem yet because most people don't have CGNAT addresses but the problem will become bigger.

loup-vaillant on Aug 27, 2021 [–]

Hotmail sometimes blocks not only my IPv4 address, but the entire subnet. We already have collateral damage.

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