第二节:防火墙和加农炮:分开的系统,显著的相似
Figure 1. Simplified logical topology of the Great Cannon and Great Firewall
(图1:简化的巨炮和GFW的逻辑拓扑)
In general, a firewall serves as an in-path barrier between two networks: all traffic between the networks must flow through the firewall. In contrast, an on-path system like the Chinese “Great Firewall” (GFW) sits off to the side: it eavesdrops on traffic between China and the rest of the world (TAP in Figure 1), and terminates requests for banned content (for example, upon seeing a request for “http://www.google.com/?falun
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