DNS
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... used in this document are to be interpreted as specified in [BCP 14].
Other terms used in this document are defined in the DNS
specification, RFC 1034std13.
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Here is the format of the SRV RR, whose DNS type code is 33:
...
... Proto
The symbolic name of the desired protocol, with an underscore
(_) prepended to prevent collisions with DNS labels that occur
in nature. _TCP and _UDP ...
... address record lookups for existing
protocols, and DNS administrators should try to provide address
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... hosts, it seems advisable to have a list of address records at
the same DNS node as the SRV RR, listing reasonable (if perhaps
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Currently there's a practical limit of 512 bytes for DNS replies.
Until all resolvers can handle larger responses, domain
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... This size estimate is extremely crude, but shouldn't underestimate
the actual answer size by much. If an answer may be close to the
limit, using a DNS query tool (e.g. "dig") to look at the actual
answer is a good idea.
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... Weight, the server selection field, is not quite satisfactory, but
the actual load on typical servers changes much too quickly to be
kept around in DNS caches. It seems to the authors that offering
administrators ...
... TTLs to the SRV RRs, which would limit the usefulness of the DNS
caching mechanism, thus increasing overall network load and
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Moving this information to the DNS makes it less necessary to update
these files on every single computer of the net every time a new
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... services, and more important for the router
operations and DNS operations personnel to cooperate.
...
... Elz, R. and R. Bush, "Clarifications to the DNS Specification", RFC 2181, July 1997. ...
... Armijo, M., Esibov, L. and P. Leach, "Discovering LDAP Services with DNS", Work in Progress. ...
... Hornstein, K. and J. Altman, "Distributing Kerberos KDC and Realm Information with DNS", Work in Progress. ...