Linux beaglebone 3.8.13-bone60 #1 SMP Mon Jul 7 20:34:48 UTC 2014 armv7l GNU/Linux
Element 14 Revision C board
Just flashed with flasher.
It takes between some seconds up to 3 mins to obtain an IPv4 address.
When I start the BBB with network cable connected, I get the IPv4 address after 20-30s (perfect :D).
The problem comes if I disconnect the network cable and connect it again without turning off the BBB, then it takes really long.
I get always the IPv6 address after some seconds (up to 13s until now)
How did I measure it?