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Because of the danger of a distributed-denial-of-service attack on a domain name server, many companies outsource their domain name service management to companies such as Akamai. EveryDNS allows webmasters to use their servers for geographically distributed DNS service for free.
MaraDNS is a free software DNS server by Sam Trenholme that claims a good security history and ease of use. [ 9 ] [ 10 ] In order to change any DNS records, MaraDNS needs to be restarted. Like djbdns dnscache, the MaraDNS 2.0 stand-alone recursive resolver ("Deadwood") does not use threads.
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dnsmasq caches DNS records, reducing the load on upstream nameservers and improving performance, and can be configured to automatically pick up the addresses of its upstream servers. dnsmasq accepts DNS queries and either answers them from a small, local cache or forwards them to a real, recursive DNS server.
DNS hijacking, DNS poisoning, or DNS redirection is the practice of subverting the resolution of Domain Name System (DNS) queries. [1] This can be achieved by malware that overrides a computer's TCP/IP configuration to point at a rogue DNS server under the control of an attacker, or through modifying the behaviour of a trusted DNS server so that it does not comply with internet standards.
In addition to its technical impact, DNS blocking also has many social and political implications. Free speech and due process are key concerns regarding DNS blocking, particularly in the United States. DNS blocking was proposed to be mandated by the Stop Online Piracy Act (SOPA) and the PROTECT IP Act (PIPA). [4]
One example of blocking malicious domains is to stop botnets, by interrupting the DNS names the botnet is programmed to use for coordination. [8] Another use is to block ad serving sites, either using a host's file-based sinkhole [9] or by locally running a DNS server (e.g., using a Pi-hole). Local DNS servers effectively block ads for all ...
DNS spoofing, also referred to as DNS cache poisoning, is a form of computer security hacking in which corrupt Domain Name System data is introduced into the DNS resolver's cache, causing the name server to return an incorrect result record, e.g. an IP address.