Ok the story begins with an evening of updating PCs and leaving a machine to upgrade to Win 10 overnight on my home network. I woke up to an email saying out of licenses - using 153 out of 100 licenses. By the time I had found the problem it was pushing 200 licenses. The problem was a wired laptop with the wifi left enabled - The wifi card was playing hide and seek - present then not present - presumably restarting the ipv6 stack and generating a new temporary ipv6 address at the rate of 30 an hour. Thankfully Astaro licensing appears to expire ipv6 addresses after 24 hours not 7 days.
Now walking round the house was no hardship but how would you find this in a work situation. I thought of looking at the out of scope addresses, pinging them and then looking at the output of 'netsh interface ipv6 show neighbors' and using the mac address to find the device in an asset database but the ipv6 address is possibly a legitimate temporary address. It is further complicated by the fact that the active IP list doesn't appear to be dynamic but generated at some interval. By the time the IP addresses appear in the list the offending laptop could be in MacDonalds.
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