Kostis Netzwerkberatung is specialized on networks, especially

• data centre operations
• network design (LAN, WAN)/li>
• firewall design and configuration/li>
• router configuration, switch configuration (especially Cisco)/li>
• IP infrastructure services: DNS, DHCP, WINS
• Microsoft Windows 2003/2008 networks using TCP/IP/li>

Kostis Netzwerkberatung customers generally have complex, heterogeneous networks consisting of (alphabetical order):

• Linux servers (e.g. Red Hat, Ubuntu ) - DNS, DHCP, WINS, Samba, apache etc.
• Microsoft Windows 2003/2008 server
• Microsoft Windows XP/Vista/7 workstation
• Unix variants: HP UX/True64, IBM/AIX, Sun Solaris
• WAN using MPLS abd VPN

Also:

• Cisco routers (1812, 2621XM, 2811 etc.)
• Cisco switches (2940, 2950, 2960(G), 3560(G), 3750(G), 45xx, 65xx)
• Cisco ASA Firewalls (5505)

For IP address administration and automated creation of consistent data for DNS/bind (named) and DHCP (dhcpd), Kostis Netzwerkberatung wrote a web base open source application: netdb.
netdb is running at a number of my customer sites at no license cost under Linux and HP UX. It also runs fine under FreeBSD.

Kostis Netzwerkberatung customers range from public administration, non-profit organizations, banks, insurance companies, IT outsourcing to automotive industry (truck manufacturers) and telecommunication industry located in the following western European countries: Austria, Belgium, Denmark, France, Germany, Great Britain, Netherlands, Spain and Switzerland.