arm: add more text describing interaction between automatic-interface-scan and interf...

diff --git a/doc/arm/Bv9ARM-book.xml b/doc/arm/Bv9ARM-book.xml
index e9d4e280c95fd082a4f89f69a0e4f4f260411f69..6be700c820758429efa363b46625e0068b9f00e8 100644 (file)
--- a/doc/arm/Bv9ARM-book.xml
+++ b/doc/arm/Bv9ARM-book.xml
@@ -5441,15 +5441,21 @@ options {
              <term><command>automatic-interface-scan</command></term>
              <listitem>
                <para>
-                 If <userinput>yes</userinput> and supported by the OS,
-                 automatically rescan network interfaces when the interface
-                 addresses are added or removed.  The default is
-                 <userinput>yes</userinput>.
-               </para>
-               <para>
-                 Currently the OS needs to support routing sockets for
-                 <command>automatic-interface-scan</command> to be
-                 supported.
+                 If <userinput>yes</userinput> and supported by the operating
+                 system, automatically rescan network interfaces when the
+                 interface addresses are added or removed.  The default is
+                 <userinput>yes</userinput>.  This configuration option does
+                 not affect time based <command>interface-interval</command>
+                 option, and it is recommended to set the time based
+                 <command>interface-interval</command> to 0 when the operator
+                 confirms that automatic interface scanning is supported by the
+                 operating system.
+               </para>
+               <para>
+                 The <command>automatic-interface-scan</command> implementation
+                 uses routing sockets for the network interface discovery,
+                 and therefore the operating system has to support the routing
+                 sockets for this feature to work.
                </para>
              </listitem>
            </varlistentry>
@@ -8443,10 +8449,11 @@ avoid-v6-udp-ports { 40000; range 50000 60000; };
                  minutes. The default
                  is 60 minutes. The maximum value is 28 days (40320 minutes).
                  If set to 0, interface scanning will only occur when
-                 the configuration file is  loaded. After the scan, the
-                 server will
-                 begin listening for queries on any newly discovered
-                 interfaces (provided they are allowed by the
+                 the configuration file is loaded, or when
+                 <command>automatic-interface-scan</command> is enabled
+                 and supported by the operating system. After the scan, the
+                 server will begin listening for queries on any newly
+                 discovered interfaces (provided they are allowed by the
                  <command>listen-on</command> configuration), and
                  will stop listening on interfaces that have gone away.
                  For convenience, TTL-style time unit suffixes may be