Referring to the main relevant topics of information safety in enterprise's network of research, a lot of enterprises has adopted IP/VPN (IP Virtual Private Network) way to carry on the information transmission. Although the transmission by the above method are not invaded by the external hacker, but the most invaders or hackers are most coming from employees of the companies according the facts or practical experience. the reasons are the employee knowing the host computer address, and where information data are put, or the staff do not understand safely about information . Therefore it is not conscientious that the system is infected or Trojan horse-planted, which will cause the management burden, and even influence enterprise's operation due to the security loophole.
This thesis will hopefully make customized IDS (Intrusion Detection System) which will satisfy the company requirement for internal operation, provide real-time intrusion information to detect if the system is intruded, generate a lot of resourceful reports to top managers by using user-friendly interface, and offer the historical data to check and verify for the future .