Unable to get IP address from DHCP since upgrading

Hi all,
I upgraded my machine to Mountain Lion last night. Ever since then I have been unable to get any IP information using DHCP. Each time I hit Renew Lease within the Network control panel I just get back a self assigned IP address. If I look in the system logs I see the following generated each time my machine tries to look for the DHCP server:
Jul 26 01:32:27 Lightning.local configd[22]: bootp_session: bind port 68 failed, No route to host
Jul 26 01:32:27 Lightning.local configd[22]: bootp_client_open_socket: S_get_bootp_socket() failed, No route to host
Jul 26 01:32:27 Lightning.local configd[22]: bootp_client_bind_socket_to_if(en1, 6): session socket isn't open
Jul 26 01:32:27 Lightning.local configd[22]: bootp_session_transmit: neither bpf nor socket send available
Jul 26 01:32:27 Lightning.local configd[22]: bootp_client_bind_socket_to_if(en1, 0): session socket isn't open
Jul 26 01:32:28 Lightning.local configd[22]: bootp_session_delayed_close(): socket is already closed
I've tried rebooting, clearing the PRAM, deleting Prefs, etc, but nothing seems to have worked.
Anyone any ideas what is going on or what else to try? It used to work perfectly before I upgraded.
Thanks

I am also having this problem since I upgraded to Mountain Lion. I did an upgrade from Lion, not a clean install. I had done a clean install of Lion though. In my case, the network connection is working most of the time, but it is droping one a day. Deactivating the Ethernet and the Wi-Fi adapters and reactivating them does not help.
Here is my what I am getting in the console when I have lost internet connection and I try to renew the DHCP lease:
2012-08-30 6:13:59.158 PM configd[17]: bootp_session: bind port 68 failed, No route to host
2012-08-30 6:13:59.158 PM configd[17]: bootp_client_open_socket: S_get_bootp_socket() failed, No route to host
2012-08-30 6:13:59.158 PM configd[17]: bootp_client_enable_receive(en0): failed
2012-08-30 6:14:00.158 PM configd[17]: bootp_session_delayed_close(): socket is already closed
And I get a self assigned IP.
I hope Apple will have a fix for this soon!
Cheers!
JF

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