mDNSShared/dnsextd.8

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  17 .Dd August 2004             \" Date
  18 .Dt dnsextd 8               \" Document Title
  19 .Os Darwin                  \" Operating System
  20 .\"
  21 .Sh NAME
  22 .Nm dnsextd
  23 .Nd BIND Extension Daemon   \" Name Description for whatis database
  24 .\"
  25 .Sh SYNOPSIS
  26 .Nm
  27 .\"
  28 .Sh DESCRIPTION
  29 .Nm
  30 is a daemon invoked at boot time, running alongside BIND 9,
  31 to implement two EDNS0 extensions to the standard DNS protocol.
  32 .Pp
  33 .Nm
  34 allows clients to perform DNS Updates with an attached lease lifetime,
  35 so that if the client crashes or is disconnected from the network, its
  36 address records will be automatically deleted after the lease expires.
  37 .Pp
  38 .Nm
  39 allows clients to perform long-lived queries. Instead of rapidly polling
  40 the server to discover when information changes, long-lived queries
  41 enable a client to indicate its interest in some set of data, and then
  42 be notified asynchronously by the server whenever any of that data changes.
  43 .Pp
  44 .Nm
  45 has no user-specifiable command-line argument, and users should not run
  46 .Nm
  47 manually.
  48 .\"
  49 .Sh SEE ALSO
  50 .Xr mDNS 1
  51 .Xr mDNSResponder 8
  52 .Pp
  53 For information on Dynamic DNS Update, see RFC 2136
  54 "Dynamic Updates in the Domain Name System (DNS UPDATE)"
  55 .Pp
  56 For information on Dynamic DNS Update Leases, see
  57 .Pa http://files.dns-sd.org/draft-dns-update-leases.txt
  58 .Pp
  59 For information on Long-Lived Queries, see
  60 .Pa http://files.dns-sd.org/draft-dns-llq.txt
  61 .\"
  62 .Sh BUGS
  63 .Nm
  64 bugs are tracked in Apple Radar component "mDNSResponder".
  65 .\"
  66 .Sh HISTORY
  67 The
  68 .Nm
  69 daemon first appeared in Mac OS X 10.4 (Tiger).