On Windows 2000 or Windows 2003, you or your system administrator can create an IPSec policy to restrict SQL Server access to only certain IP addresses or a range of IP addresses. This is the easiest way.
K. Brian Kelley
http://www.truthsolutions.com/
Author: Start to Finish Guide to SQL Server Performance Monitoring
http://www.netimpress.com/
K. Brian Kelley
@kbriankelley