Network Security Assessment Top Ten Tips to Make Attackers’ Lives Hell by Chris McNab, author of Network Security Assessment 03/25/2004

I run a lot of penetration testing exercises against client networks and systems. A lot of the time, testing is relatively straightforward, as the network administrator is not filtering ICMP traffic, and my network scans are not proactively blocked. I love this type of testing, as it's easy and quick to undertake.

http://www.onlamp.com/pub/a/security/2004/03/25/ntwksecurityassess.html