dhclient sending request to port 67 locking system up

[Ken D'Ambrosio]

>> Nov  6 21:43:55 main dhclient[1370]: send_packet: Operation not 
>> permitted
>> Nov  6 21:43:55 main dhclient[1370]: dhclient.c:2386: Failed to send 
>> 300
>> byte long packet over fallback interface.

Unfortunately, my logs seem to have scrolled (or it didn't go into 
them), but I'm pretty sure this is the same error I got when I tried to 
get a DHCP lease when I plugged my phone into my Raspberry Pi during a 
cable outage.  It turned out that the USB interface generated when I 
plugged my phone in was getting a MAC address of 0:0:0:0:0:0 -- not 
terribly helpful.  I assigned a Completely Random(tm) address thusly:
ifconfig <interface name> hw ether 12:34:56:78:9a:bc
tried dhclient again, and it worked like a charm.  So I would 
recommending taking a look at the output of "ifconfig <interfacename>", 
and seeing if anything's wonky with your MAC.

-Ken