The Globus Toolkit is an open source software toolkit used for building Grid systems and applications. It is being developed by the Globus Alliance and many others all over the world. A growing number of projects and companies are using the Globus Toolkit to unlock the potential of grids for their cause. The globus-net-manager package contains: Network Manager The Globus Net Manager library is a plug-in point for network management tasks, such as: - selectively open ports in a firewall and allow these ports to be closed when transfers are complete - configure a virtual circuit based on a site policy and route traffic over this circuit - route network traffic related to a task over a particular network