Comment by simoncion

> What’s the advantage for me with ipv6?

I don't know what your situation is, but I'm a regular programmer-type employee who has been through more mergers than I ever expected to. Every company I've been at used IPv4 addresses for the systems on their internal networks.

I've observed that one of the things that takes the longest to sort out after the merger "closed" (or whatever they call the "It's official. We now own you." phase) is merging the two company's internal networks. While some of the delay comes from removing redundant systems and "harmonizing" security policies and the like, the IT folks who I talked to about the process always told me that the thing that takes by far the longest time is IP address management... specifically, having to renumber networks and the systems on them, and reconfigure or reinstall the software on them to account for the renumbering.

If you're using IPv6's ULA addressing for your internal networks, the odds of an address collision are very nearly zero. With IPv4 addressing... unless your network is tiny, the odds appear to be very nearly one.