Information Series on DNS: Part 13

Abhijeet Modi/ September 22, 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 SRV records, what are they used for, and how do they work?

The SRV records are used for suggesting the host and port-related information for certain services, like VoIP as well as instant messaging. Most types of SRV records consist of information about the server and the IP address, but SRV records also contain ports for the given IP address. The internet protocols might not function without the SRV records.

The records mention the weight and the priority of different types of servers. Note that the servers consisting of a higher weight are highly likely to generate considerably more traffic as compared to those with less weight and the same priority. The SRV records are identified by RFC 2782.

What are SSHFP Records, what are they used for, and how do they work?

The SSHFP records are another type of DNS record that is used for identifying SSH keys linked to the hostname. These records work for only the DNSSEC-signed domains. They also consist of fingerprints for the public keys. The records are identified by RFC 4255 and the main application of these records is in SSH public key fingerprint. The records are used for the verification of the host.

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

TKEY stands for the transaction key and the records are mainly used for the domain name system. You can use the TKEY records in multiple modes in order to set the shared keys between the server and a resolver. The records are identified by RFC 2930 and it is used in conjunction with the TSIG.

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