Hi there,
I understand correctly what you need and it will be my pleasure to share with about network security.
Indeed, I am a holder of the following certificates: CISCO CCNA SECURITY, Administration Server and ITE. Currently I am doing my CCNP SECURITY.
I worked in virtual environment with hypervisor and configuration of servers (Windows/Linux). So I had the chance to develop security solutions for networks of any size (Firewall dedicated, Cisco ASA/ZPF, Zeroshell Server, PF Sence, Proxy server...).
I also worked in the areas of penetration testing with BackTrack and Kali Linux and other unorthodox technique.
So I hope to give you more details if you decide to contact me.
Regards