| Summary: | 碩士 === 國立中興大學 === 電機工程學系所 === 94 === Since the growing development of Internet technology, there is more and more application on Internet. But when network used more and more extensive, the network attack occurs more often. Consequently the system needs to improve security, and to avoid being attacked or invaded. In addition when more devices have capability to connect Internet, must use Gateway to connect each other and share Internet. So the Gateway must to improve security too. The Linux Security Module (LSM) is interface with Kernel API and User Application. It use the way of “Load Module”, enable our security rules combine in Kernel. This paper implement Gateway includes both NAT and DHCP on platform of IXDPG425. Besides we implement security rules with LSM to against backdoor, worms, port scans, SYN flooding attack. We also offer system’s logs and protection of results for administers to look up and research.
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