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If DNS resolution is disrupted but the site is not blocked in other ways, it may be possible to access a site directly through its IP address or modifying the host file. Using alternative DNS servers, or public recursive name servers (especially when used through an encrypted DNS client), may bypass DNS-based blocking. [1]
Technitium DNS Server [18] [19] is a free, opensource [20] (GPLv3), [21] cross platform, authoritative, caching and recursive DNS server software. It supports DNS-over-TLS, DNS-over-HTTPS, and DNS-over-QUIC encrypted DNS protocols. [22] It also supports DNSSEC signing and validation for RSA and ECDSA algorithms with both NSEC and NSEC3. The DNS ...
The software received US$2.2 million (HK$17.1 million) in seed funding from the US State Department. [14] Lantern is hosted on a wide variety and continually changing set of data centers around the world. It has used Digital Ocean at times, which was briefly reported as blocked in Iran during the civil unrest on January 2, 2018. [15]
Unbound is a validating, recursive, and caching DNS resolver product from NLnet Labs. It is distributed free of charge in open-source form under the BSD license . Features
Reverse DNS queries are used to map IP addresses to domain names. They are PTR queries for subdomains of in-addr.arpa (for IPv4 addresses) [ 3 ] and ip6.arpa (for IPv6 addresses). [ 4 ] For example, to find the domain name associated with the IP address 203.0.113.22, one would send a PTR query for 22.133.0.203.in-addr.arpa .
For instance, university websites commonly employ multiple domains under one IP address. Moreover, IP level packet-filtering can be surpassed by using a distinct IP address for certain content while still being linked to the same domain or server. [58] Gateway-based content control software may be more difficult to bypass than desktop software ...
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.
tinydns — a database-driven DNS server. walldns — a "reverse DNS wall", providing IP address-to-domain name lookup only. rbldns — a server designed for DNS blacklisting service. pickdns — a database-driven server that chooses from matching records depending on the requestor's location. (This feature is now a standard part of tinydns ...