Hello Markus,   
      
   On Saturday October 03 2015 15:46, you wrote to me:   
      
    MvdV>> Indeed the MAC address gives out some information. I doubt it   
    MvdV>> is all that useful for a hacker and if he wants the MAC address   
    MvdV>> that he can not entice the system to reveal it in some other   
    MvdV>> way.   
      
    MR> It's not about hackers, it's about being tracked by advertising and   
    MR> marketing companies.   
      
   They seem to do that pretty well without me explicitly broadcasting my MAC   
   address.   
      
    MR>>> And DNS is no real issue since most are used to DynDNS for quite   
    MR>>> a while.   
      
    MvdV>> Really? I haven't used it in years.. And only for IPv4, never   
    MvdV>> for IPv6.   
      
    MR> Not everyone got a static IP address inclusive. In Germany you would   
    MR> have to choose an expensive business tariff for that.   
      
   In The Netherlands IP adresses are either static or semi static. The dsl   
   providers issue static addresses. The cable boys issue addresses that are   
   technically dynamic but that do not change unlees the MAC address of the   
   interface is changed or during a _very_ long break. My address has not chaged   
   in five years.   
      
    MvdV>> For a professional that may be an issue. For a hobby server.   
    MvdV>> Mwah.. it seldom happens and changing the AAAA record is no big   
    MvdV>> deal..   
      
    MR> If you have to do that 3 times within a few weeks, you'd automate it.   
      
   I did not have to change my IPv6 address. Ever.   
      
    MvdV>> I wonder what excuse the ISPs have for not simply issuing   
    MvdV>> static IPv6 prefixes. Dynamic addresses made sense in the dial   
    MvdV>> up age, when a small poool of adresses could be used for many   
    MvdV>> more users because they never were on line all at once. That   
    MvdV>> changed with te coming of home routers that usually were left on   
    MvdV>> 24/7 and so occupied an IP address 24/7. They needed one   
    MvdV>> address per customer anyway.   
      
    MR> Germany has a strong privacy law and ISPs are happy to charge you more   
    MR> for a business trariff with a static address/prefix.   
      
   I know that privacy is very important in Germany. I wish we had the same   
   attitude here in The Netherlands. But I do not see how changing the IPv6   
   prefix is going to do much good to protect privacy. It seems like an execise   
   in futility. One might as well argue that the number on your car should change   
   every six month to protect privacy.   
      
    MvdV>> With IPv6 there never was such an excuse anyway. There is no   
    MvdV>> shortage of addresses and there will not be for the foreseeable   
    MvdV>> future. Why not give everyone a static prefix?   
      
    MR> I fully agree. The best approach would be to set dynamic prefixes as   
    MR> default and let the customer change that to static if he likes to.   
      
   That would be an option.   
      
    MvdV>> AFAIK, the Dutch IPSs that offer native IPv6 all issue static   
    MvdV>> prefixes.   
      
   Although that may change as well. Ziggo is rolling out IPv6 now. Since 14   
   September new customers get native IPv6 with ds-lite. It is too early to tell   
   if the IPv6 prefixes they offer are static.   
      
    MR> Won't happen here :-(   
      
   Hmmmm...   
      
   Cheers, Michiel   
      
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