Harrington, in Ethernet Networking for the Small Office and Professional Home Office, 2007 Application Proxy FirewallsĪpplication proxy firewalls take a different approach than the two previously mentioned types. However, if you are using a proprietary protocol, an application proxy might not be the best solution for you. For most highly used vanilla applications such as Web browsing or HTTP, this is not a problem. Furthermore, when the application proxy needs to interact with all of today's different applications, it needs to have some sort of engine to interact with the applications it is connecting to. Even today, with extremely high performance, general-purpose CPUs and efficient operating systems, application proxies still tend to have significant variation in performance in real-world environments. On a small scale, the slowdown will not be a persistent problem, but when you get into a high-end requirement with many concurrent connections this is not a scalable technology. Because the application proxy essentially has to initiate its own second connection to the destination system, it takes twice the amount of connections to complete its interaction. The first downfall of the application proxy, as depicted in Figure 1.10, is performance. However, this is not dominant technology today for several reasons.
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