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Managing Advanced DNS Records

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SRV (service) Records

SRV (service) records are an expansion of features provided by MX (mail) records. Where MX records work only for mail delivery and provide "failover" via the Priority value, SRV records add in support for load balancing (via the Weight value) and port selection (via the Port value).

This flexibility makes SRV records fairly complex and both the Host and Data fields of SRV records are different from other record types.

The Host field of an SRV record is composed of three parts separated by periods (.). These parts are Service, Proto, and Name.

  • Service The symbolic name of the desired service, an underscore (_) is added to the service identifier to avoid confusion with DNS labels. Network Solutions has provided a drop down list to ensure correct formatting.
  • Proto The symbolic name of the desired protocol, with an underscore (_) added to prevent collisions with DNS labels that occur in nature. Network Solutions has provided a drop down list to ensure correct formatting.
  • Name The domain and/or host this Record refers to.

The Data value for an SRV record is comprised of four parts separated by spaces. These parts are Priority, Weight, Port and Target.

  • Priority The priority of this target host. Clients will attempt to contact the target host with the lowest numbered priority it can reach. This value is a number between 0 - 65535.
  • Weight The weight field specifies a relative weight for entries with the same priority. Larger weights are given a proportionately higher probability of being selected. This value is a number between 0 - 65535. If you have only a single SRV record, use 0 as the weight.
  • Port The port on this target host of this service. This value is a number between 0 - 65535. This is often as specified in Assigned Numbers but need not be, and may in any case be different from the default port defined for a service.
  • Target The domain name of the target host. There must be one or more address records for this name, the name must NOT be an alias. A Target of "." means that the service is decidedly not available at this domain.