Building a More Secure Network(Secure Network Design with little outlay)

Free & Open Source Tools OpenBSD (Berkeley Software Distribution) Provide high performance with stability, security Provide greater level of TCP protocol security syslog, firewalling Packet Filter Packet Filtering OS fingerprinting of ingress traffic Load balancing, NAT, etc. OpenSSH Tripwire TCPWrapper Traceroute, Nmap, fingerd, EtheApe : Assessing the Security