IPv6 and SLAAC

IPv6 is coming our way and we have to learn how to manage it right :)

If you think you will never ever need IPv6 in your internal network, take a look at Microsoft's DirectAccess solution. Very smart way to provide 'always connected to corp net' solution but relaying on IPv6 :)
I agree in some cases when you network is simple enough you can just switch on isatap and relay on some magic, but if you are serious about knowing troubleshooting your stuff, you'd better learn IPv6.

Network guru Ivan Pepelnjak has good post on where to start, but I'll just provide short instructions on how to disable SLAAC and privacy for Windows (from Vista/WS2008 and on) users.




SLAAC or stateless address autoconfiguration is a way for hosts within a network to assign themselves IPv6 address, with correct prefix and prefix length, gateway...

However in many cases you don't need thing happening on their own in your server room, especially if it is related to server connectivity as a result you sometimes need to disable those 'auto magic' stuff.

To disable SLAAC in Windows first check what NIC you would like to disable auto configuration on
with:

netsh interface ipv6 show interface

Then execute

netsh interface ipv6 set interface X routerdiscovery=disabled

where X is desired interface index from the show command output.

To disable privacy execute (command works globally for all interfaces):

netsh interface ipv6 set privacy state=disable store=persistent
netsh interface ipv6 set global randomizeidentifiers=disabled store=persistent