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Stateful Inspection refers to an extension of packet-by-packet filtering process that tracks individual flows, enabling policy checks that extend across series of packets[1]. Many firewalls have implemented Stateful Inspection technology, such as Cisico PIX[2], 3COM Secure Gateway[3], Netsreen Firewall[1]and Checkpoint FW-1[4]. Stateful Inspection requires a session table whose entries typically record source and destination IPaddresses and port numbers. For each arriving packet, the session table is looked up for a match. A session entry in the format is created whenthe first packet appears from a flow previously not tracked. Subsequent packets of an established session are checkedagainst the session table rather than against the Rule Base. The performance of Stateful Inspection firewall mainly depends on the performance of processing session table. Eexisted session table architectures have bad timeout processing performance. This paper proposed a new architecture for session table, which improves firewall’s performance greatly. An ASIC is implemented for the proposed architecture and corresponding algorithms, which can improve firewall’s performance further.This document is a template for papers submitted to International Journal of Information Technology. If your paper is intended to this journal, please observe this format. Do not change the fonts or line spacing to squeeze more text into a limited number of pages.
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