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A comment on AWS adds an extra 5.5M IPv4 addresses. Parent comment

Re:AWS adds an extra 5.5M IPv4 addresses by remuskaos on Saturday August 14, 2021 @02:57PM (#28183089)
How do ipv6-only customers reach ipv4 hosts? Wouldn't some 6to4 gateway count as CGN?

I've had this problem in the past with Vodafone, sometimes their AFTR (?) would go down but all ipv6 enabled hosts were still reachable. Only the ipv4 internet was unreachable. It took months for me to find that out, and I still don't know any workaround in case that happens again.

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Re:AWS adds an extra 5.5M IPv4 addresses by wmf on Saturday August 14, 2021 @03:26PM (#28183293)
I think Comcast is running dual-stack so they don't have IPv6-only customers.

T-Mobile is running IPv6-only using 464 which is vulnerable to AFTR problems like you saw.

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