Host Discovery with nmap
by Mark Wolfgang - Tuesday, 12 November 2002.
As a Computer Security Engineer that regularly conducts external penetration tests, a recurring challenge seems to arise when assessing organizations with a large allocation of IP address space. What does one do when faced with multiple class B's, a few class C's, and a limited amount of time? Do you stick all of the address space in your favorite scanner and hit the Go button, wait till it's done and hope the results are accurate? How can you be sure that your scanner found all the hosts that are accessible? Do you even know the method your scanner uses to discover which hosts are alive?

This document attempts to answer the above questions, and will illustrate (at a very technical level) the methodology that I use to accurately discover which hosts are accessible prior to conducting port scanning or a vulnerability assessment.

Download the paper in PDF format here.

Spotlight

Whitepaper: 10 things your next firewall must do

For enterprises looking at Next-Generation Firewalls, the most important consideration is: will this new technology empower your security teams to securely enable applications to the benefit of the organization? It's not about blocking applications, but safely enabling them.


Weekly newsletter

Reading our newsletter every Monday will keep you up-to-date with security news.
  



Daily digest

Receive a daily digest of the latest security news.
  
DON'T
MISS

Fri, May 29th
    COPYRIGHT 1998-2015 BY HELP NET SECURITY.   // READ OUR PRIVACY POLICY // ABOUT US // ADVERTISE //