Information Series on DNS: Part 14

Abhijeet Modi/ June 14, 2021/ Blog

The following series of articles details information of DNS Records, we are covering each setting in the series, providing basic use and purpose.

What are TLSA records, what are they used for, and how do they work?

As the name implies, the TLSA records are mainly used for associating the domain name with the public key. It is the TSLA records that help the website owners store the SSL certificate of their domain in the DNS. Identified by RFC 6698, this record forms the TLSA certificate association.

What are TSIG records, what are they used for, and how do they work?

The major application of the TSIG record is for updating the secondary DNS server. It’s possible to make DNS queries without requiring any authentication, but all types of updates in the DNS system are to be verified and authenticated. TSIG stands for Transaction Signature and it can be used for the authentication of the different types of updates. It can also be used for authenticating the responses generated from the approved recursive server. The TSIG records are identified by RFC 2845.

What are TXT records, what are they used for, and how do they work?

The TXT record was mainly designed for human-readable data, but it has now become a source that carries the machine-readable information, as given by the RFC 1464. These records allow you to enter text in the DNS. It was mainly designed as a place where you could put the human-readable data, but now the records can be used for machine-readable data as well. Note that one domain could be associated with different TXT records.

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