I setup a system with two gigabit network cards to serve as a router between two classroom networks. 192.168 on one side, 10.10 on the other. Everything seemed to work for the last 2-3 months except we found that the Microsoft people could not ftp from workstations (both 98 & xp) to windows 2000/2003 server. Message is that connection is dropped by host. We can ftp to the windows servers using linux. Removing the linux box and going back to a 10mb Cisco router allows the windows systems to work.
This is a classroom not connected to the internet so I have allowed all traffic to pass through router. We have also looked at the packets and can’t see anything different between the MS ftp packets and linux ftp packets.
The classroom must be able to support a mixture of Linux and Windows systems.