At Castle Rock we're totally focused on providing you with market leading Network Management software. Our products allow you to take control of your network, regardless of size or complexity. Castle Rock Computing commenced operations in 1987. We applied many years of experience with LAN networking to our first product, the ES200 Ethernet Bridge. This bridge was the fastest on the market at 12500 fps. With an early emphasis on OEM relationships, many leading hardware vendors licensed and private-labeled our bridge technology.