On 2018-03-18 22:34, Michiel van der Vlist : Markus Reschke wrote:   
   > Hello Markus,   
   >   
   > On Sunday March 18 2018 11:41, you wrote to All:   
   >   
   >  MR> OpenBSD does SLAAC with variable prefix length now. It doesn't have to   
   >  MR> be /64, it can also be /60 or /68 for example.   
   >   
   > I have mixed feelings about this.   
   >   
   > + It allows more flexibility. For example if your ISP just gives you   
   >   one /64, you can still have multiple subnets. E.g by cutting the   
   >   /64 in 65536 /80s. Should be enough for everyone.   
   >   
   > - The providers can use this as an argument to just give you one /64.   
      
   As long as the outside gets its own range (/64 or smaller) I think many   
   could survive with "only" 18446744073709551616 v6 ips to go, split into   
   several smaller nets, as long as their software handles it.   
      
   I think there was some ndp exhaustion attack where you were advised to   
   use something like /120 for link nets (not using SLAAC there of course)   
   in order for routers to not have to keep huge NDP tables for that link,   
   so in that sense most software should be able to think in smaller than   
   /64 nets and now, also for dynamic client configuration on obsd.   
      
   ---   
    * Origin: nntp://news.fidonet.fi - Lake Ylo - Finland (2:221/6)