chapter-05-working-with-proxy-servers-and-application-level-firewalls-資料下載頁
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【正文】 ource application Acts as a proxy server and caches files for Web and FTP servers Not fullfeatured ? Performs access control and filtering ? Quickly serves files that are held in cache Runs on UNIXbased systems Popular。 plugins available Economical WinGate Most popular proxy server for home and small business environments Welldocumented Windowsbased program Offers customer support and frequent upgrades Symantec Enterprise Firewall Combines proxy services with encryption, authentication, load balancing, and packet filtering Configured through a snap in to the MMC Commercial firewall with builtin proxy servers More fullfeatured than WinGate Microsoft Inter Security amp。 Acceleration Server (ISA) Complex, fullfeatured Includes stateful packet filtering, proxy services, NAT, and intrusion detection Competes with highperformance firewall products Two Editions of ISA Standard Edition ? Standalone ? Supports up to four processors Enterprise Edition ? Multiserver product with centralized management ? No limit on number of processors supported Reverse Proxies Monitor inbound traffic Prevent direct, unmonitored access to server’s data from outside the pany Advantages ? Performance ? Privacy Reverse Proxies When a Proxy Service Isn’t the Correct Choice Can slow down traffic excessively The need to authenticate via the proxy server can make connection impossible If you don’t want to use your own proxy server: ? External users can connect to firewall directly using Secure Sockets Layer (SSL) encryption ? Use proxy server of an ISP Chapter Summary Overview of proxy servers and how they work Goals of proxy servers Vulnerabilities and other drawbacks that proxy servers bring to a security setup Kinds of proxy servers Comparison of proxybased firewalls
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