随着因特网日益普及， 许多高校都建立了自己的校园网。因特网上黑客已经成为越来越严重的问题， 因特网日益成为一个不安全的网络。校园网如何与因特网连网才能保证网络安全， 这个问题已成为各校园网建设的难题 With the increasing popularity of the Internet, many colleges and universities have established their own campus network. Hackers on the Internet have become increasingly serious problems, and the Internet is increasingly becoming an insecure network. How to connect the campus network with the Internet to ensure network security, this problem has become a problem of the construction of the campus network