[ubuntu] how to log tftp transfer using dhcpd.conf?

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http://ubuntuforums.org – I want to log when client booted via tftp&pxe. but, my current configuration has problem that logs every ip assigning. so I can't distinguish between normal IP assigning and pxe booting. I REALLY NEED TO KNOW HOW TO LOG TFTP BOOT USING dhcpd.conf PLEASE HELP ME. (Hardware)