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<samba:parameter name="bind interfaces only"
type="boolean"
context="G"
xmlns:samba="http://www.samba.org/samba/DTD/samba-doc">
<description>
<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 <smbconfoption name="interfaces"/> parameter. <command moreinfo="none">nmbd</command>
also binds to the "all addresses" 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 <smbconfoption name="bind interfaces only"/> 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
<smbconfoption name="interfaces"/> 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 <smbconfoption name="interfaces"/> 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 <smbconfoption
name="interfaces"/> parameter. This restricts the networks that <command moreinfo="none">smbd</command> will
serve, to packets coming in on 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 <smbconfoption name="bind interfaces only"/> is set and the network address
<emphasis>127.0.0.1</emphasis> is not added to the <smbconfoption name="interfaces"/> parameter list
<citerefentry><refentrytitle>smbpasswd</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
<smbconfoption name="bind interfaces only"/> is set then unless the network address
<emphasis>127.0.0.1</emphasis> is added to the <smbconfoption name="interfaces"/> 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>
</description>
<value type="default">no</value>
</samba:parameter>
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