Perimeter defense is one level of defending your network from attacks, and it works wonderfully to protect as a firewall from external attacks. Perimeter defense is just part of the protection suite. Defense in depth means that several layers of security protect your network and its data, here is a list of free tools that can improve the security posture of your Perimeter defenses:
Network perimeter defenses
- Gatekeeper – First open source Distributed Denial of Service (DDoS) protection system.
- fwknop – Protects ports via Single Packet Authorization in your firewall.
- ssh-audit – Simple tool that makes quick recommendations for improving an SSH server’s security posture.
