Combining DNS and NATD
Jonathan de Boyne Pollard
J.deBoynePollard at Tesco.NET
Fri Dec 10 04:42:31 UTC 2004
BM> SRV records offer that possibility, but almost nothing uses them.
... where "almost nothing" is a measure of user visibility, or of
relative service protocol bandwidth consumption, rather than of
application types. The applications that end-users mostly "see", web
browsers, don't use "SRV" lookups, much to the shame and embarrassment
of their authors. But many of the applications in the less end-user
visible parts of systems *do*. Some NICNAME clients use "SRV" lookups,
and a surprisingly large number of registries now publish the locations
of their NICNAME servers via "SRV" resource records. LDAP clients use
"SRV" lookups. (As end-user popularity is our metric, note that the
LDAP clients in the most popular desktop PC operating system use "SRV"
lookups.) At least one LDAP server, the OpenLDAP "root" server, uses
"SRV" lookups, too. Kerberos clients use "SRV" lookups. At least two
SMTP Relay clients, mine and exim, are now fully capable of using "SRV"
lookups. At least one FTP client, LFTP, uses "SRV" lookups.
Internet is not the World Wide Web, and not all service clients are web
browsers. Don't let the lamentable situation with web browsers colour
your perceptions of overall "SRV" lookup use.
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