Protocols/Technologies
IPV4, TCP, UDP, ICMP, SMTP, POP3, IMAP4, SNMP, ARP, DHCP, FTP, RADIUS, NFS, SAN
NAT, Frame Relay
Unix Type Operating Systems
LINUX
RedHat7.x, 8, 9 to Enterprise Linux FedoraCore x, CentOS 5x Slackware 8,9.x Mandrake9 Ubuntu / Debian
WINDOWS
Microsoft Server 2000/2003/2008
Active Directory
Group Policy
Microsoft ISA 2004/2006, Forefront TMG 2010
Microsoft Exchange 2000/2003/2007/2010
Mdaemon Email Server
Virtualization / Thin Clients
VMWare Infrastructure 3 (ESX Server, VMware VCenter)
VirtualBox
Citrix XEN Server
Microsoft Hyper-V
Applications
SMTP Qmail, Sendmail
POP/IMAP CourierImap, Fetchmail, Qpopper, Dovecot
WEB Apache (mod _php, mod_jk2, mod_jserv, mod_auth, Virtual webhosting, chroot)
Tomcat
Squid
DNS Bind (acls, replication)
Monitoring/Graphing Nagios, MRTG
Aniti Spam/Anti Virus Spamasassin with razor2 pyzor bayes, OpenBSDs spamd (grey listing), ClamAV, qmail-scanner
SNMP
DHCP ISC DHCP Server(Linux installation using PXE boot)
FTP