DarkReading.com
http://www.darkreading.com/security/vulnerabilities/showArticle.jhtml?articleID=217800409
“A popular method of saving IP address space in enterprise networks could expose businesses to hackers who might use it to interrupt service or steal data, according to a well-known security researcher.”
RSnake’s blog post
http://www.sectheory.com/rfc1918-security-issues.htm
RFC 1918 – Address Allocation for Private Internets
http://www.faqs.org/rfcs/rfc1918.html