DSLreports - Security test (1)
Broadband news, information and community, port scan
http://www.dslreports.com/scan
DSLreports - Security test (2)
Broadband news, information and community, system message
http://www.dslreports.com/secureme
Wat is een Firewall?
Firewalls / filters
http://www.claymania.com/firewall-filter-dutch.html
Windows Firewalls
Windows Firewalls
http://tucows.skynet.be/firewall95.html