Make the delete command specific to A RRs. This prevents ddclient from
deleting other RRs unrelated to the dynamic address, but on the same
FQDN. This can be specifically a problem with KEY RRs when using SIG(0)
instead of symmetric keys.
Reported by: Wellie Chao
Bug report: http://sourceforge.net/p/ddclient/bugs/71/
The 'nsupdate' protocol is used to submit Dynamic DNS Update requests as
defined in RFC2136 to a name server using the 'nsupdate' command line
utility part of ISC BIND. Dynamic DNS updates allow resource records to
be added or removed from a zone configured for dynamic updates through
DNS requests protected using TSIG. BIND ships with 'ddns-confgen', a
utility to generate sample configurations and instructions for both the
server and the client. See nsupdate(1) and ddns-confgen(8) for details.
