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dnsextd(8) [osx man page]

dnsextd(8)						    BSD System Manager's Manual 						dnsextd(8)

dnsextd -- BIND Extension Daemon SYNOPSIS
dnsextd is a daemon invoked at boot time, running alongside BIND 9, to implement two EDNS0 extensions to the standard DNS protocol. dnsextd allows clients to perform DNS Updates with an attached lease lifetime, so that if the client crashes or is disconnected from the net- work, its address records will be automatically deleted after the lease expires. dnsextd allows clients to perform long-lived queries. Instead of rapidly polling the server to discover when information changes, long-lived queries enable a client to indicate its interest in some set of data, and then be notified asynchronously by the server whenever any of that data changes. dnsextd has no user-specifiable command-line argument, and users should not run dnsextd manually. SEE ALSO
mDNS(1) mDNSResponder(8) For information on Dynamic DNS Update, see RFC 2136 "Dynamic Updates in the Domain Name System (DNS UPDATE)" For information on Dynamic DNS Update Leases, see For information on Long-Lived Queries, see BUGS
dnsextd bugs are tracked in Apple Radar component "mDNSResponder". HISTORY
The dnsextd daemon first appeared in Mac OS X 10.4 (Tiger). Darwin June 2, 2019 Darwin

Check Out this Related Man Page

MDNSD(8)						    BSD System Manager's Manual 						  MDNSD(8)

mdnsd -- Multicast and Unicast DNS daemon SYNOPSIS
mdnsd (also known as mDNSResponder on some systems) is a daemon invoked at boot time to implement Multicast DNS and DNS Service Discovery. On Mac OS X 10.6 (Snow Leopard), mdnsd is also the system-wide Unicast DNS Resolver. mdnsd listens on UDP port 5353 for Multicast DNS Query packets. When it receives a query for which it knows an answer, mdnsd issues the appropriate Multicast DNS Reply packet. mdnsd also performs Unicast and Multicast DNS Queries on behalf of client processes, and maintains a cache of the replies. mdnsd has no user-specifiable command-line argument, and users should not run mdnsd manually. LOGGING There are several methods with which to examine mdnsd's internal state for debugging and diagnostic purposes. The syslogd(8) logging levels map as follows: Error - Error messages Warning - Client-initiated operations Notice - Sleep proxy operations Info - Informational messages By default, only log level Error is logged. A SIGUSR1 signal toggles additional logging, with Warning and Notice enabled by default: # pkill -USR1 mdnsd A SIGUSR2 signal toggles packet logging: # pkill -USR2 mdnsd A SIGINFO signal will dump a snapshot summary of the internal state to /var/log/system.log: # pkill -INFO mdnsd FILES
/usr/sbin/mdnsd SEE ALSO
dns-sd(1), pkill(1), syslogd(8) For information on Multicast DNS, see For information on DNS Service Discovery, see For information on how to use the Multicast DNS and the DNS Service Discovery APIs on Mac OS X and other platforms, see For the source code to mdnsd, see HISTORY
The mdnsd daemon first appeared in Mac OS X 10.2 (Jaguar). Also available from the Darwin open source repository (though not officially supported by Apple) are mdnsd daemons for other platforms, including Mac OS 9, Microsoft Windows, Linux, FreeBSD, NetBSD, Solaris, and other POSIX systems. BUGS
mdnsd bugs are tracked in Apple Radar component "mDNSResponder". BSD
February 27, 2011 BSD
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