On 11/08/2019 23.45, James Knott wrote:
On 2019-08-11 05:24 PM, Carlos E. R. wrote:
IPv6 uses something called a DUID, which ensures you get the same prefix.
https://en.wikipedia.org/wiki/DHCPv6#DHCP_Unique_Identifier Do ISP provided routers support this? :-?
I can't say for certain, but they should. pfSense certainly does.
Huh, maybe I understood badly or did not ask well.
I mean the ISP prefix. Each machine gets an IP which is composed of the "external" prefix and a locally generated suffix. In my local DNS server I would have to write the whole IP and corresponding names, or use another IP number that is valid only locally.
But the ISP can give me a different IP v6 prefix every time I boot the router. Spain, remember? They charge extra to fix the prefix, like for fixed IPv4 addresses. I have no personal direct confirmation of this, but it is what we expect to get.
The prefix is whatever is assigned to the local network. My ISP assigns me a /56 prefix, which I can then split into 256 /64s, if I wish. I'm currently using only 3. So, my main network has a "0" as part of it's prefix, my test LAN "3" and I use "ff" for my VPN. Because of the DUID I always get the same /56.
Any ISP that charges for consistent prefixes (by consistent, I mean unlikely to change) is not one I would want to do business with. The IPv6 address space is so huge, there's no reason for anyone to charge for something like that. It's just plain greed. He.net won't do that to you.
I agree it makes no sense. Yes, it is plain greed. It makes business sense to them, though. Change ISP? I guess all will do the same - if one doesn't, then it is possible the rest will change. Long ago, here, they gave fixed address to everyone that got a connection. At some point, they changed to dynamic, and had the the cheek to charge for the /improvement/ (of being dynamic). Their commercial representatives where bewildered when talking to customers that were incensed by the change, they did not understand. At some point, they charged for "static IP". They want to keep charging for static IPv6 IPs; I'd bet the most I can bet on safe bets, ie, ten cents, that they will do it (I'm trying to paraphrase Asimov). Customer support query (Spanish): <https://comunidad.movistar.es/t5/Hogar-Fijo-Internet-TV/IPv6-est%C3%A1tica/td-p/3796824> (last April) The gist of the answers: - fixed IPv4: 25€/month. - No IPv6 for customers - They do not deny fixed IPv6 will have a cost. Thus, I understand my question is absurd to you, but you see, it will be a need here. -- Cheers / Saludos, Carlos E. R. (from 15.0 x86_64 at Telcontar)