System Admin, Linux Admin, ISO27001, PCI-DSS, HIPAA, Extensive knowledge on Security tools,Linux (uClinux, RedHat, Debian and personalized embedded versions), BSD (NetBSD,Free BSD and OpenBSD), Solaris and QNX. Microsoft Windows workstation & Network Operating systems, Server, Kernel & services hardening ( Linux, BSD and Solaris), Unix systems security (TCP Wrappers, firewall & IDS), VPN – IPSec, L2TP, PPTP, OpenSSH VPN, Encrypted Tunnels over HTTP, Nessus, Sara, Nmap, Ethereal, Ettercap,Snort, Firewalk, Whisker/Libwhisker, John the Ripper, L0phtCrack, Ntop, The Coroner's Toolkit