| Summary: | 碩士 === 大同大學 === 通訊工程研究所 === 96 === The purpose of the Brctl is a virtual network interface, which consists of many network interfaces. Those network interfaces transfer packets for each other. The Tcpdump captures packets from the virtual network interface. The IPTables blocks packets in particular shape or form from the virtual network interface. People have a lot of scruple about the current network security including virus, Trojan horse, backdoor programs and, stealing personal information, but those aren’t the most important things for many apparatus. They attach great importance to control of internal information, that those information are transmitted by transferring files, Email and, instant message. This paper provides methods of recording or blocking network packets that build network security. This paper’s system process nine network protocols like HTTP, FTP, TELNET, SMTP, POP3, MSN, Yahoo Messenger, AOL/AIM/ICQ and, Google Talk. HTTP, FTP and, TELNET belong to transferring files or presenting data. SMTP and POP3 belong to EMail. At last, MSN, Yahoo Messenger, AOL/AIM/ICQ and, Google Talk belong to instant message.
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