Multimedia data transmission and control using active networks
Computer Communications
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Active Networking adds programmability to the elementsof the network, most aggressively by using programmablepackets, or capsules.ANTS [22, 21] and PLANet [10, 8] arethe most mature examples of capsule-based systems, bothhaving been publicly available for several years.This paperpresents our experience with these systems and the lessonsthey hold for the future of capsule-based Active Networking.The paper focuses on four key issues: flexibility, performance,security, and usability.We consider how ANTS and PLANetaddress these issues, noting that despite substantial surface differences, both systems identify similar key problems and use closely related solutions. Based on our experience with these systems we conclude that capsule-based systems can achieve useful levels of flexibility, performance, and usability. Many aspects of security can also be adequately addressed, but some important problems related to denial of service remain as open problems.