Do you need to define the mac address of the device that needs to be blocked, or even assign the device a permanent lan ip address and block that also.
What router are you using?
in fact, it appears to be a bit more complex than i thought, but i googled blocking skype and there are plenty of answers available.
Firmware: DD-WRT v24SP2-EU-US (08/19/10) std
BT Home Hub 4
Edited by Mitchy_mitch (Sun 11-Aug-13 13:16:11)