Active network equipment: Cisco, D-Link, Linksys, Foxgate
- TCP / IP Stack, OSPF (single-, multi-arrea), RIPv2, STP, Vlan (VTP), trunk, acces port, etherchannel on CISCO equipment (CCNA level)
OS: Linux (RHEL, SLES, CentOS, Ubuntu), FreeBSD, Windows Server
Networking:
- Packet Filtering / Traffic shaping / routing: iptables, IPFW
- DHCP: dhcpd, MS DHCP Server
- DNS: named (bind), ddns, MS DNS Server, MS WINS Server
- VPN: pptpd, OpenVPN, IPsec
Monitoring: Nagios, Cacti, Zabbix
Web server: Apache, Apache Tomcat, Nginx, MS IIS
File server: vsftpd, proftpd, Samba
Mail:
- MTA: Exim, Sendmail, Postfix
- Spam / virus filters (for MTAs): Amavis, SpamAssassin, ClamAV
- MDA: fetchmail, procmail
Proxy Server: Squid
Directory Service: slapd, MS Active Directory
Storage Technology: RAID, LVM
Server Instant Messaging: jabberd
VoIP Server: Asterisk (FreePBX)