Just login via your regular pc.. Then clone/copy your mac address
from that device and specify it in:
/etc/network/interfaces
On the beagle..
allow-hotplug eth0
iface eth0 inet dhcp
hwaddress ether 66:55:44:33:22:33
Then you'll have a choice of one or the other..
If that doesn't work, request access from IT or get creative with
pringle can's..
Regards,