<div dir="ltr"><br>On Mon, Aug 31, 2015 at 9:40 AM, Rob Funk <<a href="mailto:rfunk@funknet.net">rfunk@funknet.net</a>> wrote:<br>[snip] <br>><br>> My home machines seem to<br>> be slowly accumulating more global-scope IPv6 addresses on the network<br>> that Time-Warner assigned. They started with two (one based on the MAC<br>> address and one seemingly random), but now they have four and five<br>> addresses.<br>><br>> Anyone know what's up with that? Something weird with dhcp6?<br><br><br>My guess would be the IPv6 privacy extension: <a href="https://tools.ietf.org/html/rfc4941">https://tools.ietf.org/html/rfc4941</a> . As I understand it there was a concern with addresses based on MAC address that the MAC portion would be unique to the NIC even on different networks. The RFC's approach is to periodically generate a new IPv6 address and use it for communication. I believe you can use sysctl to control it.<br><br>--<br>William Hooper</div>