The development of heterogeneous grid infrastructure is in its infancy and the potential impact of unauthorized network connections and/or potential system corruption is a serious concern. This paper addresses the need for the integration of a dynamic firewall into a grid-enabled application environment. By its very nature, a grid-computing environment consists of a dynamic collection of applications, resources, and services that require access to network ports. The focus of this paper is on developing a dynamic iptables-based firewall that is capable of automatically identifying valid grid user/application network port connection requests and satisfying these requests based on a Globus proxy.
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