![]() ![]() 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. config.yml:/app/config.Web filters that are based on the HTTP proxy server principle are part of the standard toolkit for protecting corporate networks. ![]() For example, you could set up common DNS servers as the upstream and the domain blacklist from abuse.ch ( Listing 1) and then launch Blocky with the command: docker run -name blocky-v. Before launching, you need to prepare a simple configuration file named config.yml. To test Blocky, start the Docker container on an available Linux server and configure it as the DNS server for your computer. By default, Blocky does not collect any information about requesting clients or domain names. Here, too, you can configure different upstream resolvers, depending on the requesting client, or forward requests to different resolvers each time. If you want to use your own domain names on your local network, Blocky lets you resolve internal names yourself or forward corresponding requests to other DNS servers. Even easier, you can choose the Docker image that is also provided and simply launch Blocky in a container. However, the binary for the tool is a useful alternative if you want to take a look at Blocky first without installing an extensive Go development environment. If you go to the Blocky website, you can download the sources, written in the Go programming language, and compile the project yourself. With DoH – in contrast to DNS over TLS (DoT specified in RFC 7858), with DNS packets themselves encrypted by TLS – even the DNS query as such can no longer be immediately identified if the DNS service provider also delivers classic web pages over the same port. After encrypting the HTTP query by the Transport Layer Security (TLS) protocol, requested domains are no longer revealed by sniffing unencrypted DNS packets. The idea behind DoH is to boost the privacy of the querying users. The filters can differ to match the groups on your local network (e.g., different filter rules can be implemented in different departments).īlocky supports the DNS over HTTPS (DoH) protocol described by RFC 8484, which was published three years ago. The tool lets you effectively filter domains on the basis of blacklists and whitelists or regular expressions. īlocky, a DNS proxy and ad blocker for local networks, has been under active development by German developer Dimitri Herzog since January 2020 and is available on GitHub. ![]() Moreover, researchers at the University of Bonn have shown that almost 20 percent of HTTP requests load advertising content and that blocking these ads reduces the power consumption of terminal devices. The Domain Name System (DNS) puts you in a position to contain the spread of malware and prevent suspicious activities within your corporate network and, with appropriate filters on your DNS server, prevent user tracking and advertising on websites. ![]()
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