Annotated edit history of
SRV version 1, including all changes.
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SRV is a type of ResourceRecord which tries to get away from the traditional requirement in TCP/IP that every new application protocol needs its own fixed port number for clients to connect to. Since the [DNS] is good for looking up names, an SRV record defines a name for the service (which is easier for users to remember than a number, anyway), and equates that to a domain name and port number to which the client should connect. This way the service can run on any available port number; multiple services of the same type can run on the same machine (just using different ports); and a service can be moved from one machine to another, and provided the SRV record is suitably updated, users need never be the wiser. |
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Of course, all these capabilities were being offered by AppleTalk networking about two decades ago. |
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SRV records are defined in [RFC2782|ftp://ftp.rfc-editor.org/in-notes/rfc2782.txt]. |
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