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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.
Domain Name System blocking, or DNS blocking / filtering, is a strategy for making it difficult for users to locate specific domains or websites on the Internet.It was first introduced in 1997 as a means to block spam email from known malicious IP addresses.
The first is "dynamic DNS updating" which refers to systems that are used to update traditional DNS records without manual editing. [1] These mechanisms use TSIG to provide security. The second kind of dynamic DNS permits lightweight and immediate updates often using an update client, which do not use the RFC 2136 standard for updating DNS records.
The process starts when a security-aware resolver sets the "DO" ("DNSSEC OK") flag bit in a DNS query. Since the DO bit is in the extended flag bits defined by Extension Mechanisms for DNS (EDNS), RFC 6891, all DNSSEC transactions must support EDNS. EDNS support is also needed to allow for the much larger packet sizes that DNSSEC transactions ...
This article is for beginners, who have recently get started with the computer and the Internet. If you already know what a DNS server is and how does it work, then please skip this guide because ...
The response to a successful TSIG update will also be signed with a TSIG record. Failures are not signed to prevent an attacker from learning anything about the TSIG key using specially crafted update "probes". The nsupdate program can use TSIG to do DNS updates. The TSIG record is in the same format as the other records in the update request.
A DNS name server is a server that stores the DNS records for a domain; a DNS name server responds with answers to queries against its database. The most common types of records stored in the DNS database are for start of authority ( SOA ), IP addresses ( A and AAAA ), SMTP mail exchangers (MX), name servers (NS), pointers for reverse DNS ...
A newer variant of domain fronting, domain hiding, passes an encrypted request for one resource (say, a website), concealed behind an unencrypted (plaintext) request for another resource whose DNS records are stored in the same cloud. It has much the same effect. [3] Refraction networking is an application of the broader principle.