ISPs More Likely To Throttle Netizens Who Connect Through Carrier-Grade NAT: Cloudflare

An anonymous reader shares a report: Before the potential of the internet was appreciated around the world, nations that understood its importance managed to scoop outsized allocations of IPv4 addresses, actions that today mean many users in the rest of the world are more likely to find their connections throttled or blocked. So says Cloudflare, which last week published research that recalls how once the world started to run out of IPv4 addresses, engineers devised network address translation (NAT) so that multiple devices can share a single IPv4 address. NAT can handle tens of thousands of devices, but carriers typically operate many more. Internetworking wonks therefore developed Carrier-Grade NAT (CGNAT), which can handle over 100 devices per IPv4 address and scale to serve millions of users. That's useful for carriers everywhere, but especially valuable for carriers in those countries that missed out on big allocations of IPv4 because their small pool of available number resources means they must employ CGNAT to handle more users and devices. Cloudflare's research suggests carriers in Africa and Asia use CGNAT more than those on other continents. Cloudflare worried that could be bad for individual netizens. "CGNATs also create significant operational fallout stemming from the fact that hundreds or even thousands of clients can appear to originate from a single IP address," wrote Cloudflare researchers Vasilis Giotsas and Marwan Fayed. "This means an IP-based security system may inadvertently block or throttle large groups of users as a result of a single user behind the CGNAT engaging in malicious activity. Blocking the shared IP therefore penalizes many innocent users along with the abuser."

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