Hello Nicholas,   
      
   On Friday October 02 2015 15:35, you wrote to me:   
      
    NB> Every so often either my internet connection or my router hiccups, and   
    NB> my dhcp server on that machine much see a hiccup in the connection so   
    NB> it attempts to reconnect with another ipv6 address suffix.   
      
   You got half of it fixed. 1:154/10 answers on IPv6. 1:154/701 does not.   
      
    NB> So, until I notice or someone tells me it remains that way until I   
    NB> reset the network interface on that machine, or reboot it. Then it   
    NB> goes back to the normal MAC based one it usually has.   
      
   You might consider not using SLAAC or DHCP6 but assign a fixed IPv6 address to   
   the interface instead. Such as 2001:470:1f11:6e5:f1d0:1:154:10   
      
      
   Cheers, Michiel   
      
   --- GoldED+/W32-MSVC 1.1.5-b20130111   
    * Origin: 2001:470:1f15:1117::1 (2:280/5555)