NxFilter is a freeware DNS filter that can compete with commercial products in terms of functionality and performance. This limitation can be solved with the help of a DNS filter, which can monitor all the traffic, regardless of the protocol used to send or receive data. However, latency is not the only problem: Proxy servers primarily specialize in filtering HTTP connections. These latency problems grow with the number of users. The use of such filters, often employing the Squid proxy server and similar tools, leads in practice to serious latency problems on the network because the proxy server analyzes and filters the web traffic and thus becomes a bottleneck.
Web filters that are based on the HTTP proxy server principle are part of the standard toolkit for protecting corporate networks.
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