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03-Nov-2019 03:30

All answers from DNSSEC protected zones are digitally signed.By checking the digital signature, a DNS resolver is able to check if the information is identical (i.e.One of the first things that a responsible ESP must deal with, before starting to mail on behalf of their customers, is Reverse DNS (r DNS from now on). Note: This is the first in our series of tutorials on how to set up authentication mechanisms for your mail server, including r DNS, SPF, DKIM, and DMARC.This is true for businesses that send out their own email, as well. One of the first things that a responsible ESP must deal with, before starting to mail on behalf of their customers, is Reverse DNS (r DNS from now on).The Domain Name System Security Extensions (DNSSEC) is a suite of Internet Engineering Task Force (IETF) specifications for securing certain kinds of information provided by the Domain Name System (DNS) as used on Internet Protocol (IP) networks.It is a set of extensions to DNS which provide to DNS clients (resolvers) origin authentication of DNS data, authenticated denial of existence, and data integrity, but not availability or confidentiality.tinydns does authoritative nameserving via UDP only; it does not do recursive nameserving, nor does it answer TCP queries (axfrdns does that).

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While protecting IP addresses is the immediate concern for many users, DNSSEC can protect any data published in the DNS, including text records (TXT), mail exchange records (MX), and can be used to bootstrap other security systems that publish references to cryptographic certificates stored in the DNS such as Certificate Records (CERT records, RFC 4398), SSH fingerprints (SSHFP, RFC 4255), IPSec public keys (IPSECKEY, RFC 4025), and TLS Trust Anchors (TLSA, RFC 6698).

RFC 6672 wisely advises (due to certain DNSSEC quirks) against wildcard use without, sadly, expressly forbidding it.

But first, the generic format: The DNAME substitutes all names below those appearing in the lefthand name (owner-name) with the redirection-name (or alias if you prefer).

It is a potentially confusing, yet powerful, RR that should be used with extreme care.

It is CNAME like, but while CNAME provides a single substitution (or aliasing) at the owner (left-hand) name of the associated CNAME RR, DNAME provides substitution (or aliasing) at all levels below the owner-name associated with the DNAME RR. dnscache is a recursive resolver, intended to be listed in 's "nameserver" entry. It imposes restrictions on what it will return; that's why it was written.

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