When I start Internet Sharing /etc/bootpd.plist is not created and the other device is not assigned an IP address.

Just like the tite says. I am investigating why my Macbook Pro (3,1) running Mountain Lion will not assign an IP address to a computer connected via Ethernet when Internet Sharing is turned on (laptop receiving WiFi connection, supposed to be sharing connection over ethernet). I tested using a relatives macbook and it worked just fine. It turns out my laptop is not creating the file: /etc/bootpd.plist when Internet Sharing is turned on.
I have a console log here from when I start internet sharing:
8/11/12 12:01:13.634 PM
InternetSharing[724]
objc[724]: Object 0x7f94c940ead0 of class __NSDictionaryM autoreleased with no pool in place - just leaking - break on objc_autoreleaseNoPool() to debug
8/11/12 12:01:13.642 PM
com.apple.InternetSharing[724]
bind(bootps 67): Address already in use
8/11/12 12:01:13.642 PM
com.apple.InternetSharing[724]
error creating internal interface for devname bridge0@0: Address already in use
8/11/12 12:01:13.644 PM
com.apple.InternetSharing[724]
no bridge interface to service en0
8/11/12 12:01:13.644 PM
com.apple.InternetSharing[724]
unable to create service for en0
8/11/12 12:01:13.645 PM
com.apple.InternetSharing[724]
_MISStartServiceDHCPWithOptions "en0": Operation not supported by device
8/11/12 12:01:13.645 PM
com.apple.InternetSharing[724]
*** no external service
8/11/12 12:01:38.065 PM
com.apple.InternetSharing[724]
*** no external service
Any help is appreciated!

Solved it, at least temporarily:
Investigate process binding port 67 with the following command:
sudo lsof -i 67
Close the offending process (in this case: bootps):
sudo /bin/launchctl unload -w /System/Library/LaunchDaemons/bootps.plist
Start internet sharing again from the system preferences panel

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When I start Internet Sharing /etc/bootpd.plist is not created and the other device is not assigned an IP address.

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