this post was submitted on 05 Feb 2024
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IPv6 is here, and has been for a long time. But if, for example, your web or email server can only be reached over IPv6 some people will not be able to load the site or send emails to you.
The entire internet is configured to work with IPv4. Some of the internet (less than a quarter) is also configured to also work with IPv6.
Imagine if your home had two driveways on different streets. Do you tell everyone both addresses, or do you pick one of them? Probably just one right? Now imagine if the second address can only be reached if someone has an off road capable vehicle. And you don't know what vehicle someone has - which address would you give them? Is it even worth having two driveways?
That's the situation we're in. IPv4 support is required and works perfectly. IPv6 is optional and doesn't always work.
Except it doesn't work perfectly, because it has a relatively small address space. That's why ipv6 exists.
The driveway works perfectly, but it doesn't have space for all the guests if they all want to use their own vehicles.
Thankfully, we have carpooling and rideshares.
Great analogy, thanks