phranque - 6:15 am on Oct 23, 2012 (gmt 0)

make sure you understand the implications before you implement your solution.

Cloaking - Webmaster Tools Help:
http://support.google.com/webmasters/bin/answer.py?hl=en&answer=66355 [support.google.com]

Official Google Webmaster Central Blog: How Google defines IP delivery, geolocation, and cloaking:
http://googlewebmastercentral.blogspot.com/2008/06/how-google-defines-ip-delivery.html [googlewebmastercentral.blogspot.com]