Start both machines with System Rescue CD http://www.sysresccd.org/Main_Page

ON SLAVE MACHINE - new harddrive
net-setup eth0         (or wlan0)
nc -l -p 9000 | dd of=/dev/sda

ON MASTER MACHINE - old harddrive that needs to be copied
net-setup eth0            (or wlan0)
dd if=/dev/sda | nc 192.168.0.254 9000

To monitor the status of dd command:
pidof dd          - returns pid for dd command
kill -USR1 pid from previous command

reference: http://www.rajeevnet.com/hacks_hints/os_clone/os_cloning.html

end.