With the development of computer network, the number of people on the Internet is increasing, and the resources on the Internet are also increasing. The openness, sharing and interconnection of the network are also expanding, so the security of the network is also an issue that we should pay attention to now. This paper introduces a safe and feasible solution-firewall technology. Firewall technology is a technical measure to protect computer network security developed in recent years. It is actually an access control technology. It can set obstacles between an organization's network and unsafe network, prevent illegal access to information resources, and use it to prevent confidential information from being insured. Illegal output on guard network.<BR>
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