Kostis Netzwerkberatung is specialized on

• networks, especially
• Microsoft Windows NT/2000/2003 networks using TCP/IP
• network design (LAN, WAN)
• firewall design and configuration
• router configuration, switch configuration (especially Cisco)
• IP infrastructure services: DNS, DHCP, WINS

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

• Linux servers (e.g. Red Hat) - DNS, DHCP, WINS, Samba, apache, i4l, etc.
• Microsoft Windows NT/2000/2003 server
• Microsoft Windows95/98/NT/2000/XP workstations
• Unix variations: HP UX/True64, IBM/AIX, Sun Solaris
• WANs via Frame Relay, D64S(2), ISDN dial-in/dialup, modem dial-in (incl. callback)

Also:

• Cisco routers (80x,100x, 160x, 17xx, 25xx, 26xx, 36xx, 4000)
• Cisco switches (19xx, 29xx, 35xx, 55xx, 65xx)
• Checkpoint Firewall-1 via GUI under HP UX

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 to automotive industry (truck manufacturers) and the telecommunication industry located in the following western European countries: Austria, Belgium, Denmark, France, Germany, Great Britain, Netherlands, Spain and Switzerland.