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/64 is a subnet. End customers get /56 to /48 so that they can run multiple subnets. It is, unfortunately, more common than it should be for ISPs to not even gi

/64 is a subnet. End customers get /56 to /48 so that they can run multiple subnets. It is, unfortunately, more common than it should be for ISPs to not even give the minimum of that range though. Changing your prefix every half an hour would be... unusual, at least, although again I wouldn't put it past some ISPs to do that (possibly unintentionally)... but sounds like your prefix might be changing every time you do a DHCPv6-PD request, which makes me wonder if your DHCPv6 client might be generating a new DUID for every request rather than remembering it.

Arnt 6y ago
It's a subnet, yes. GP declared it to be approximately the same as an end customer. How do you know that the ISP replacing it often is "unusual, to say the least"? Or is that something you know?
- Dagger2 6y ago
  There's a fair few ISPs changing the prefix every day, but this is the first I've heard of anyone changing it every half an hour. If it was common I would've heard a lot of complaining about it by now.
  - Arnt 6y ago
    Would you? You haven't heard any complaint from me, and I'm a unix greybeard with a home network and lots of incoming IPv6 connections — all I needed to do was shrink my DNS TTLs, and everything works well. Software's grown resilient to IP address changes nowadays. Even my incoming rdiff-backup jobs don't raise a noticeable number of errors.
    - Dagger2 6y ago
      I read most reddit posts that mention IPv6, as well as comments on any blog post, news story etc that makes the rounds. People bitch and moan about every little problem with v6, including blaming it for problems caused by v4 or by completely unrelated causes and with no regard for whether the problem has been fixed 20 years ago or was just imaginary in the first place. They'll even complain about the benefits it gets them. If 30-minutely prefix changes were common, people would definitely be complaining about it. ...but okay, I won't claim that I catch everything. Can I ask which ISP this is, or at least which country? Perhaps it's common in places that don't have much presence in the English-speaking parts of the internet. It's nice to hear that it mostly works for you. It should do, but a lot of software is terrible at handling dynamic changes -- it seems to be something that programmers struggle with. The biggest problem should be that long-running connections aren't possible.

Arnt 6y ago

It's a subnet, yes. GP declared it to be approximately the same as an end customer. How do you know that the ISP replacing it often is "unusual, to say the least"? Or is that something you know?

Dagger2 6y ago
There's a fair few ISPs changing the prefix every day, but this is the first I've heard of anyone changing it every half an hour. If it was common I would've heard a lot of complaining about it by now.
- Arnt 6y ago
  Would you? You haven't heard any complaint from me, and I'm a unix greybeard with a home network and lots of incoming IPv6 connections — all I needed to do was shrink my DNS TTLs, and everything works well. Software's grown resilient to IP address changes nowadays. Even my incoming rdiff-backup jobs don't raise a noticeable number of errors.
  - Dagger2 6y ago
    I read most reddit posts that mention IPv6, as well as comments on any blog post, news story etc that makes the rounds. People bitch and moan about every little problem with v6, including blaming it for problems caused by v4 or by completely unrelated causes and with no regard for whether the problem has been fixed 20 years ago or was just imaginary in the first place. They'll even complain about the benefits it gets them. If 30-minutely prefix changes were common, people would definitely be complaining about it. ...but okay, I won't claim that I catch everything. Can I ask which ISP this is, or at least which country? Perhaps it's common in places that don't have much presence in the English-speaking parts of the internet. It's nice to hear that it mostly works for you. It should do, but a lot of software is terrible at handling dynamic changes -- it seems to be something that programmers struggle with. The biggest problem should be that long-running connections aren't possible.