I am losing randomly access to mapped network drives after we changed the packet size between two ISA boxes on a VPN tunnel (the specific network name is no longer available). Since I use a GRE tunnel on my end, the packet size is 1436 bytes and there were a large amount of dropped packages when the other side used 1500 bytes. Since both using 1436 bytes now, the dropping rate improved tremendously. But now I have an issue with the network drives staying up.
Any ideas why this happens and what could I do to improve that?