DNS, is one of the oldest and most basic important applications of the Internet. Because normal services must access services through DNS, and malicious programs also need to be connected through DNS. There are so many DNS servers on the Internet that we can choose freely. However, in the campus network environment, if users are allowed to choose DNS server freely, it will cause confusion in network management and cannot systematically monitor and schedule traffic. We can't force users to set up DNS servers, which will cost a lot of manpower and management costs. In this paper, we focus on DNS redirection technology. We use the improved DNAT(DNAPT) to implement DNS redirection. So, we discuss a new application to implement DNS redirection. And through DNS redirection can solve many campus network security problems.
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