| 1 | <samba:parameter name="bind interfaces only"
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| 2 | type="boolean"
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| 3 | context="G"
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| 4 | advanced="1" wizard="1" developer="1"
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| 5 | xmlns:samba="http://www.samba.org/samba/DTD/samba-doc">
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| 6 | <description>
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| 7 | <para>This global parameter allows the Samba admin
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| 8 | to limit what interfaces on a machine will serve SMB requests. It
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| 9 | affects file service <citerefentry><refentrytitle>smbd</refentrytitle>
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| 10 | <manvolnum>8</manvolnum></citerefentry> and name service <citerefentry><refentrytitle>nmbd</refentrytitle>
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| 11 | <manvolnum>8</manvolnum></citerefentry> in a slightly different ways.</para>
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| 12 |
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| 13 | <para>
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| 14 | For name service it causes <command moreinfo="none">nmbd</command> to bind to ports 137 and 138 on the
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| 15 | interfaces listed in the <smbconfoption name="interfaces"/> parameter. <command moreinfo="none">nmbd</command>
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| 16 | also binds to the "all addresses" interface (0.0.0.0) on ports 137 and 138 for the purposes of
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| 17 | reading broadcast messages. If this option is not set then <command moreinfo="none">nmbd</command> will
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| 18 | service name requests on all of these sockets. If <smbconfoption name="bind interfaces only"/> is set then
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| 19 | <command moreinfo="none">nmbd</command> will check the source address of any packets coming in on the
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| 20 | broadcast sockets and discard any that don't match the broadcast addresses of the interfaces in the
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| 21 | <smbconfoption name="interfaces"/> parameter list. As unicast packets are received on the other sockets it
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| 22 | allows <command moreinfo="none">nmbd</command> to refuse to serve names to machines that send packets that
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| 23 | arrive through any interfaces not listed in the <smbconfoption name="interfaces"/> list. IP Source address
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| 24 | spoofing does defeat this simple check, however, so it must not be used seriously as a security feature for
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| 25 | <command moreinfo="none">nmbd</command>.
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| 26 | </para>
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| 27 |
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| 28 | <para>
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| 29 | For file service it causes <citerefentry><refentrytitle>smbd</refentrytitle>
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| 30 | <manvolnum>8</manvolnum></citerefentry> to bind only to the interface list given in the <smbconfoption
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| 31 | name="interfaces"/> parameter. This restricts the networks that <command moreinfo="none">smbd</command> will
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| 32 | serve, to packets coming in on those interfaces. Note that you should not use this parameter for machines that
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| 33 | are serving PPP or other intermittent or non-broadcast network interfaces as it will not cope with
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| 34 | non-permanent interfaces.
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| 35 | </para>
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| 36 |
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| 37 | <para>
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| 38 | If <smbconfoption name="bind interfaces only"/> is set and the network address
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| 39 | <emphasis>127.0.0.1</emphasis> is not added to the <smbconfoption name="interfaces"/> parameter list
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| 40 | <citerefentry><refentrytitle>smbpasswd</refentrytitle> <manvolnum>8</manvolnum></citerefentry> and
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| 41 | <citerefentry><refentrytitle>swat</refentrytitle> <manvolnum>8</manvolnum></citerefentry> may not work as
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| 42 | expected due to the reasons covered below.
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| 43 | </para>
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| 44 |
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| 45 | <para>
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| 46 | To change a users SMB password, the <command moreinfo="none">smbpasswd</command> by default connects to the
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| 47 | <emphasis>localhost - 127.0.0.1</emphasis> address as an SMB client to issue the password change request. If
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| 48 | <smbconfoption name="bind interfaces only"/> is set then unless the network address
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| 49 | <emphasis>127.0.0.1</emphasis> is added to the <smbconfoption name="interfaces"/> parameter list then <command
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| 50 | moreinfo="none"> smbpasswd</command> will fail to connect in it's default mode. <command
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| 51 | moreinfo="none">smbpasswd</command> can be forced to use the primary IP interface of the local host by using
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| 52 | its <citerefentry><refentrytitle>smbpasswd</refentrytitle> <manvolnum>8</manvolnum></citerefentry> <parameter
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| 53 | moreinfo="none">-r <replaceable>remote machine</replaceable></parameter> parameter, with <replaceable>remote
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| 54 | machine</replaceable> set to the IP name of the primary interface of the local host.
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| 55 | </para>
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| 56 |
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| 57 | <para>
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| 58 | The <command moreinfo="none">swat</command> status page tries to connect with <command
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| 59 | moreinfo="none">smbd</command> and <command moreinfo="none">nmbd</command> at the address
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| 60 | <emphasis>127.0.0.1</emphasis> to determine if they are running. Not adding <emphasis>127.0.0.1</emphasis>
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| 61 | will cause <command moreinfo="none"> smbd</command> and <command moreinfo="none">nmbd</command> to always show
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| 62 | "not running" even if they really are. This can prevent <command moreinfo="none"> swat</command>
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| 63 | from starting/stopping/restarting <command moreinfo="none">smbd</command> and <command
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| 64 | moreinfo="none">nmbd</command>.
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| 65 | </para>
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| 66 |
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| 67 | </description>
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| 68 | <value type="default">no</value>
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| 69 | </samba:parameter>
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