March 25, 2007

Vital Statistics

  • Name: Kostas Kalevras
  • Current Employment: Systems Administrator at NTUA Network Operations Center since 2000
  • Date of Birth: 30 September 1979
  • Name Day: 21 May
  • Areas of expertise: FreeRADIUS, OpenLDAP, Sun Directory Server products, MySQL, PHP, Perl
  • Activities: kungfu, wind surfing, skiing, basketball

Past and current jobs:

  • 2000,Today: NTUA Network Operations Center, LDAP and RADIUS server architect and administrator (15,000 users)
  • 2002,Today: Greek School Network, LDAP and RADIUS server architect and administrator (250,000 users)
  • 2003: Greek University Network (GUNET), Head of the LDAP task force
  • 2004-2005: Greek Technical Chamber (ΤΕΕ), RADIUS server architect (100,000 users)
  • 2006,Today: GRNET, RADIUS server architect and administrator for the Greek University Students ADSL service – ΦDSL (30,000 users)
  • 2010, Today: Cyta Network Provider, RADIUS server contractor

Outside Jobs:

  • Creator and maintainer of the FreeRADIUS RADIUS server web interface DialupAdmin
  • Writer and maintainer of various FreeRADIUS RADIUS server modules
  • Contributor to the pGina RADIUS plugin
  • Freelance RADIUS and LDAP consultant



  • Sun Certified Engineer for Sun ONE Directory Server 5.x (2007, score 85%)