ifupdown and dhclient for ipv6

If you're using dhcp for both ipv4 and ipv6 on ubuntu with wifi/wpa_supplicant you might have faced with weird issue with ifdown trying to release v6 (or v4, depends on ordering) lease and it finally hangs - since previous address family already brought interface down.

Fri Dec 28 12:27:32 2012 Upd.: Sat Feb 9 14:50:45 2013
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