(The enterprise accesses the Internet through the interface Serial0 of a Quidway router. The enterprise provides WWW, FTP, and Telnet services to the outside world. The internal subnet of the enterprise is 129.38.1.0. The internal FTP server address is 129.38.1.1, and the internal Telnet server address is 129.38. 1.2, the internal WWW server address is 129.38.1.3, and the enterprise external address is 202.38.160.1. Address translation is configured on the router, so that the internal PC can access the Internet, and the external PC can access the internal server. By configuring the firewall, it is hoped to achieve the following requirements: External network as long as specific users can access the internal server Internal network Only specific hosts can access the external network
Firewall typical configuration example.doc)
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