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As a engineering all my career life focused on networking, I am so depressed that IPv6 still not fully replaced IPv4

We have dozen of RFCs and vendors gears support IPv6 as well, but it just not finished

It's fine. IPv4 addresses might get too expensive at some point, encouraging their deprecation. Or it's entirely possible having the option of IPv6 prevents IPv4 addresses from getting prohibitvely costly. Either way, IPv6 has its role.

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