We have a IPSec VPN created between (2) RV042 routers with firmware version220.127.116.11. using a cable Internet connection at both ends. At the Main site, there is a Windows 2003 Server that we map a drive to for the Remote XP Pro clients (in a workgroup). We map the drive using \\LAN IP Address of Server\shared folder (contains many folders), for example \\192.168.1.50\apps. When we click on the mapped drive, there is a painfully slow response time before all the folders are displayed. One of the applications we run on the remote side, requires one of these folders, so the response for it is VERY slow. We have had moments where we try to ping the 192.168.1.50, an dget "request timed out" -like the tunnel drops altogether. We have read many posts, done other research, and it may point to an MTU issue but we are unsure how to determine the best setting. On the remote side if we go to the website Speedguide.net and run the TCP/IP Analyzer, it shows the MTU to be 1450, states it is not optimal, and recommends we increase this to 1500. We did that on the remote site's RV042, but saw no change. Questions: (1) What is the best test to determine what MTU setting our RV042 should have and does this override any MTU setting in the registry of our XP Pro clients? (2) How do we tell from the RV042 log if our tunnel has dropped it's connection? (3) are there any other settings we should concern ourselves with for speeding up the mapped drive response time? Note, we have another friend (not using Linksys products -using Edgewater routers), with the same exact setup, with the same problem.