Message-ID: <rt-4.4.1-77598-1510132912-1960.46508-0-0@isc.org>
X-RT-Original-Encoding: utf-8
X-Mailer: MIME-tools 5.508 (Entity 5.508)
Content-Type: text/plain; charset="utf-8"
References: <rt-4.4.1-66426-1510017846-253.0-0-0@isc.org>
 <RT-Ticket-46508@isc.org>
Content-Disposition: inline
X-RT-Interface: Web
MIME-Version: 1.0
In-Reply-To: <rt-4.4.1-66426-1510017846-253.0-0-0@isc.org>
Content-Transfer-Encoding: binary
RT-Send-CC:
Content-Length: 63

IPv4 is mandatory.  IPv6 may or may not exist or be configured.