sudo ifup ra0

Internet Systems Consortium DHCP Client V3.0.3
Copyright 2004-2005 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/products/DHCP

Listening on LPF/ra0/00:17:31:12:04:59
Sending on   LPF/ra0/00:17:31:12:04:59
Sending on   Socket/fallback
DHCPDISCOVER on ra0 to 255.255.255.255 port 67 interval 7
DHCPDISCOVER on ra0 to 255.255.255.255 port 67 interval 9
DHCPDISCOVER on ra0 to 255.255.255.255 port 67 interval 21
DHCPDISCOVER on ra0 to 255.255.255.255 port 67 interval 8
DHCPDISCOVER on ra0 to 255.255.255.255 port 67 interval 15
DHCPDISCOVER on ra0 to 255.255.255.255 port 67 interval 1
No DHCPOFFERS received.
No working leases in persistent database - sleeping.