You are writing security policy that hardens and prevents Footprinting attempt by Hackers.

Configure routers to restrict the responses to Footprinting requests

Configure Web Servers to avoid information leakage and disable unwanted protocols

Lock the ports with suitable Firewall configuration

Use an IDS that can be configured to refuse suspicious traffic and pick up Footprinting patterns

Evaluate the information before publishing it on the Website/Intranet

Monitor every employee computer with Spy cameras, keyloggers and spy on them

Perform Footprinting techniques and remove any sensitive information found on DMZ sites