S-251: Vulnerability in DNS Client

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DNS client nslookup

Hello, I just got done setting up a DNS server and a client. However, when I do an nslookup with just the hostname, I got this output: Microsoft Windows 2000 (C) Copyright 1985-2000 Microsoft Corp. C:\Documents and Settings\dev9>nslookup dev9 Server: webdev.testsurgemail.com Address:...

LEARN ABOUT MOJAVE

dnsextd

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

NAME

     dnsextd -- BIND Extension Daemon

SYNOPSIS

     dnsextd

DESCRIPTION

     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 http://files.dns-sd.org/draft-dns-update-leases.txt

     For information on Long-Lived Queries, see http://files.dns-sd.org/draft-dns-llq.txt

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 1, 2019 							    Darwin

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