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I tried living entirely on IPv6 for a day, and here's what happened
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this post was submitted on 02 Aug 2025
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Hey guys, I deployed our servers on 10.0.0.0/14 and didnt' bother with ipv6. Oh no! The company that we just acquired also deployed their servers on 10.0.0.0/14, so all of your assumption in your dumb-ass contrived scenario are invalidated.
ipv6 adoption only matters for public reach. Right now if you want a website accessible by 75% of the world, it has to be an ipv4 endpoint. Though that is changing. Here is a blog post by someone from akamai in 2018 talking about the rapid adoption of ipv6. https://www.akamai.com/blog/performance/six-years-since-world-ipv6-launch
Basically if you aren't deploying a service as native ipv6, you've already fucked up.
Most competent IT departments would just set up bidirectional NAT.
https://www.juniper.net/documentation/us/en/software/session-smart-router/docs/config_static_nat/
Doesn't horizontally scale. But sure if you want to have half your company only reachable through a firewall cluster and you don't ever expect to exceed 100Gb, and never need to perform maintenance on that cluster, sure it'll work.