Horizon Network Security specializes in inexpensive and effective mixed-platform Network Security using Linux-based solutions. Network security services and products include: Firewalls, Network Monitoring, Virus and Spam Filtering, Network Security Audits and Disaster Recovery and Planning. Horizon Network Security provides low-cost, reliable, Linux based Network security system. We wrote the book on Linux and network security, Real World Linux Security by Bob Toxen, published by Prentice Hall P