How much would you pay to access the ipv4 internet?
How much would you pay to access the ipv6 internet?
What are support costs for ipv6 endpoints / compatibility needs / help desk / securing / understanding / training all techs etc vs ipv4?
= ISP motivation?
ipv4 is relatively well understood, existing infrastructure to serve it, and people are willing to pay MORE to access the ipv4 internet, and basically won't pay anything to access ipv6 only internet.
If you've used ipv6 actively, plenty of stuff doesn't play well, lots of weird hangs on connections etc in deployed contexts, and even with ipv6 you can't seem to actually go endpoint to endpoint (ie, printer at work from computer at home easily). My ipv4 based vpn works great though (and doesn't support ipv6 properly). I started down path of hassling vendors, but it's not worth it. You've got your work ISP to hassle, then fix work internet gateway, then get firewall sorted, then get internal network sorted (yes, the copier runs some ancient crap), then get each employees home internet sorted, then all their machines, then all the related software. They couldn't have made the migration path harder if they had tried.
It would be more accurate to say that they couldn't have made it any _easier_ if they tried. v4 doesn't have the necessary forward compatibility for that.
How much would you pay to access the ipv6 internet?
What are support costs for ipv6 endpoints / compatibility needs / help desk / securing / understanding / training all techs etc vs ipv4?
= ISP motivation?
ipv4 is relatively well understood, existing infrastructure to serve it, and people are willing to pay MORE to access the ipv4 internet, and basically won't pay anything to access ipv6 only internet.
If you've used ipv6 actively, plenty of stuff doesn't play well, lots of weird hangs on connections etc in deployed contexts, and even with ipv6 you can't seem to actually go endpoint to endpoint (ie, printer at work from computer at home easily). My ipv4 based vpn works great though (and doesn't support ipv6 properly). I started down path of hassling vendors, but it's not worth it. You've got your work ISP to hassle, then fix work internet gateway, then get firewall sorted, then get internal network sorted (yes, the copier runs some ancient crap), then get each employees home internet sorted, then all their machines, then all the related software. They couldn't have made the migration path harder if they had tried.