I have 11 years full time working experience in IT and which 6 years of it is part of network and security engineering, I am currently providing my services at one of the largest ISP in South Africa doing setup new Solutions like Routing, Switches, Firewalls and troubleshooting, maintenance and skills transfer of existing Vodacom clients (Academic institutions, Parastals, Private and Public sectors). I also have experience in Microsoft Windows and Servers. I have International certified by Microsoft(MCSA ,Exchange and MCSE), CompTia(A= and Network+), Cisco (CCNP R&S, CCNA Security and I have completed 3 modules for CCNP Security and I am left with 1 Module to complete CCNP Security), Your issue of allowing skype need to be applied on the application control layer not with ip address , If you provide me with what kind of device you are using I will be able to assist