Network Technology Solutions (UK) Ltd
NTS(UK) - Network Technology Solutions UK
http://www.ntsuk.co.uk/

Network Security, Filters and Firewalls
General introduction to network security issues and solutions in the Internet
http://www.acm.org/crossroads/xrds2-1/security.html

Mazu Profiler - Internal Network Security and Network Security Systems
Mazu Profiler uses network behavior analysis (NBA) to enable IT organizations to manage, secure, and optimize availability and performance of business services
http://www.mazunetworks.com/

e92plus Ltd
e92plus - your it security distribution partner
http://www.e92plus.com

Sun Microsystems Security Solutions
Sun Security Products and Services
http://wwws.sun.com/software/security/

ESTec Security
ESTec Systems Corp. offers information security consulting, policy and procedure development, certified audit assistance, ISO 27001, ISO 17799, BS 7799 implementation services.
http://www.security.estec.com/

TriGeo Network Security, Inc.
TriGeo is the first industry security information event management solution to combine real-time log analysis, event correlation and active response in an affordable network appliance. With TriGeo, meeting IT security regulations is easier than ever.
http://www.trigeo.com

International Network Services
BT Professional Services is a leading global provider of business-driven information technology consulting and software solutions that help customers reduce costs, increase flexibility, strengthen security, ensure compliance and improve efficiency. Our customers include global enterprises and service providers in all major industries, including telecommunications, financial services, retail, pharmaceutical/ healthcare, manufacturing, government and travel and transportation.
http://www.ins.com/

Solucom - Internet Firewall Security and Virtual Private Network (VPN) Solutions
Providers of Virtual Private Networking (VPN), Internet Firewall Security, Intrusion Detection and Managed IT security services. This includes consulting, the technologies, configuration and installation, and ongoing support.
http://www.solucom.com

Network Security, Filters and Firewalls
This article is a general introduction to network security issues and solutions in the Internet; emphasis is placed on route filters and firewalls. It is intended as an overview. Some knowledge of IP networking is assumed, although not crucial.
http://www.acm.org/crossroads/xrds2-1/security.html