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this post was submitted on 08 Jun 2024
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I've seen a few isps here in the UK doing some weird pointless stuff with ipv6. Like dynamic prefixes. Why? What's the point?
But you can get good ones. I've had the same /48 prefix for 10 years now.
I am 50/50 between incompetence. Or so they can keep on charging extra for a static ip.
I'm fairly sure it must take extra work to make dynamic prefixes. I've heard some weird justifications about localised routing. But modern ISPs generally don't work that way at all. For example, my ISP has endpoints in multiple cities, and can fail over to another city if need be. All my static IPv4 and IPv6 instantly move with me in that event.
Yes it does take extra work. Problem is often that that work was done in the past when isp implemented their ipv4 metodology. And instead of using the ipv6 rollout as a chance to improve their design and operations. They just add ipv6 into their ipv4 design and methodology. They encumber their ipv6 rollout with their decades of technical debt and cruft they have normalized in their ipv4 world. And it will makes things harder for themselfs when trying to turn off ipv4 in the core.
Oh my God disgusting. My ISP uses dynamic prefixes also, which reflects a lack of understanding of the most basic IPv6 fundamentals.