I have created a VPN tunnel between two Netgear D834G's. I can map a drive no problem across the VPN from a Windows 2003 server to an XP Pro client. However the mapping loses the connection a couple of times a day and I have to reboot the router and the connection is restored.
The VPN tunnel is kept alive all the time. With Netgear D834G the connection is set for 9999 secs and then pings to restart the 9999 second count.