<samba:parameter name="bind interfaces only"
                 context="G"
                 advanced="1" wizard="1" developer="1"
                 xmlns:samba="http://samba.org/common">
<listitem>
        <para>This global parameter allows the Samba admin 
        to limit what interfaces on a machine will serve SMB requests. It 
        affects file service <citerefentry><refentrytitle>smbd</refentrytitle>
        <manvolnum>8</manvolnum></citerefentry> and name service <citerefentry><refentrytitle>nmbd</refentrytitle>
        <manvolnum>8</manvolnum></citerefentry> in a slightly different ways.</para>

	<para>For name service it causes <command moreinfo="none">nmbd</command> to bind 
	to ports 137 and 138 on the interfaces listed in 
        the <link linkend="INTERFACES">interfaces</link> parameter. <command moreinfo="none">nmbd</command> also 
        binds to the &quot;all addresses&quot; interface (0.0.0.0) 
	on ports 137 and 138 for the purposes of reading broadcast messages. 
	If this option is not set then <command moreinfo="none">nmbd</command> will service 
	name requests on all of these sockets. If <parameter moreinfo="none">bind interfaces
	only</parameter> is set then <command moreinfo="none">nmbd</command> will check the 
	source address of any packets coming in on the broadcast sockets 
	and discard any that don't match the broadcast addresses of the 
	interfaces in the <parameter moreinfo="none">interfaces</parameter> parameter list. 
	As unicast packets are received on the other sockets it allows 
	<command moreinfo="none">nmbd</command> to refuse to serve names to machines that 
	send packets that arrive through any interfaces not listed in the
	<parameter moreinfo="none">interfaces</parameter> list.  IP Source address spoofing
	does defeat this simple check, however, so it must not be used
	seriously as a security feature for <command moreinfo="none">nmbd</command>.</para>

	<para>For file service it causes <citerefentry><refentrytitle>smbd</refentrytitle>
	<manvolnum>8</manvolnum></citerefentry> to bind only to the interface list 
	given in the <link linkend="INTERFACES">interfaces</link> parameter. This 
        restricts the networks that <command moreinfo="none">smbd</command> will serve 
        to packets coming in those interfaces.  Note that you should not use this parameter 
        for machines that are serving PPP or other intermittent or non-broadcast network 
	interfaces as it will not cope with non-permanent interfaces.</para>

	<para>If <parameter moreinfo="none">bind interfaces only</parameter> is set then 
	unless the network address <emphasis>127.0.0.1</emphasis> is added 
	to the <parameter moreinfo="none">interfaces</parameter> parameter 
        list <citerefentry><refentrytitle>smbpasswd</refentrytitle>
	<manvolnum>8</manvolnum></citerefentry> and <citerefentry><refentrytitle>swat</refentrytitle>
	<manvolnum>8</manvolnum></citerefentry> may not work as expected due 
        to the reasons covered below.</para>

	<para>To change a users SMB password, the <command moreinfo="none">smbpasswd</command>
	by default connects to the <emphasis>localhost - 127.0.0.1</emphasis> 
	address as an SMB client to issue the password change request. If 
	<parameter moreinfo="none">bind interfaces only</parameter> is set then unless the 
	network address <emphasis>127.0.0.1</emphasis> is added to the
	<parameter moreinfo="none">interfaces</parameter> parameter list then <command moreinfo="none">
	smbpasswd</command> will fail to connect in it's default mode. 
	<command moreinfo="none">smbpasswd</command> can be forced to use the primary IP interface 
	of the local host by using its <citerefentry><refentrytitle>smbpasswd</refentrytitle>
	<manvolnum>8</manvolnum></citerefentry>	<parameter moreinfo="none">-r <replaceable>remote machine</replaceable></parameter>
	parameter, with <replaceable>remote machine</replaceable> set 
	to the IP name of the primary interface of the local host.</para>

	<para>The <command moreinfo="none">swat</command> status page tries to connect with
	<command moreinfo="none">smbd</command> and <command moreinfo="none">nmbd</command> at the address 
	<emphasis>127.0.0.1</emphasis> to determine if they are running.  
	Not adding <emphasis>127.0.0.1</emphasis>  will cause <command moreinfo="none">
	smbd</command> and <command moreinfo="none">nmbd</command> to always show
	&quot;not running&quot; even if they really are.  This can prevent <command moreinfo="none">
	swat</command> from starting/stopping/restarting <command moreinfo="none">smbd</command>
	and <command moreinfo="none">nmbd</command>.</para>

	<para>Default: <command moreinfo="none">bind interfaces only = no</command></para>
		
</listitem>
</samba:parameter>
