Grids are distributed infrastructures that have been used as an important and powerful resource for distributed computing. Since the nodes of a grid can potentially be located in different administrative domains, the underlying network infrastructure that supports grid communications has to be properly configured to provide efficient node-to-node message exchange. Currently, the management of grids and networks is performed by different and independent tools: there is no tool integration to provide, for example, an automatic network configuration. This forces grids administrators to request, in a no automated fashion, the configuration of network devices to network administrators. In this paper we present a policy translation mechanism that generates network policies from grid requirements expressed in grid policies. The paper also presents a prototype tool that allows grid administrators to define grid policies, and network administrators to define corresponding translation rules. Th...