1<samba:parameter name="bind interfaces only" 2 type="boolean" 3 context="G" 4 advanced="1" wizard="1" developer="1" 5 xmlns:samba="http://www.samba.org/samba/DTD/samba-doc"> 6<description> 7 <para>This global parameter allows the Samba admin 8 to limit what interfaces on a machine will serve SMB requests. It 9 affects file service <citerefentry><refentrytitle>smbd</refentrytitle> 10 <manvolnum>8</manvolnum></citerefentry> and name service <citerefentry><refentrytitle>nmbd</refentrytitle> 11 <manvolnum>8</manvolnum></citerefentry> in a slightly different ways.</para> 12 13 <para> 14 For name service it causes <command moreinfo="none">nmbd</command> to bind to ports 137 and 138 on the 15 interfaces listed in the <smbconfoption name="interfaces"/> parameter. <command moreinfo="none">nmbd</command> 16 also binds to the "all addresses" interface (0.0.0.0) on ports 137 and 138 for the purposes of 17 reading broadcast messages. If this option is not set then <command moreinfo="none">nmbd</command> will 18 service name requests on all of these sockets. If <smbconfoption name="bind interfaces only"/> is set then 19 <command moreinfo="none">nmbd</command> will check the source address of any packets coming in on the 20 broadcast sockets and discard any that don't match the broadcast addresses of the interfaces in the 21 <smbconfoption name="interfaces"/> parameter list. As unicast packets are received on the other sockets it 22 allows <command moreinfo="none">nmbd</command> to refuse to serve names to machines that send packets that 23 arrive through any interfaces not listed in the <smbconfoption name="interfaces"/> list. IP Source address 24 spoofing does defeat this simple check, however, so it must not be used seriously as a security feature for 25 <command moreinfo="none">nmbd</command>. 26 </para> 27 28 <para> 29 For file service it causes <citerefentry><refentrytitle>smbd</refentrytitle> 30 <manvolnum>8</manvolnum></citerefentry> to bind only to the interface list given in the <smbconfoption 31 name="interfaces"/> parameter. This restricts the networks that <command moreinfo="none">smbd</command> will 32 serve, to packets coming in on those interfaces. Note that you should not use this parameter for machines that 33 are serving PPP or other intermittent or non-broadcast network interfaces as it will not cope with 34 non-permanent interfaces. 35 </para> 36 37 <para> 38 If <smbconfoption name="bind interfaces only"/> is set and the network address 39 <emphasis>127.0.0.1</emphasis> is not added to the <smbconfoption name="interfaces"/> parameter list 40 <citerefentry><refentrytitle>smbpasswd</refentrytitle> <manvolnum>8</manvolnum></citerefentry> and 41 <citerefentry><refentrytitle>swat</refentrytitle> <manvolnum>8</manvolnum></citerefentry> may not work as 42 expected due to the reasons covered below. 43 </para> 44 45 <para> 46 To change a users SMB password, the <command moreinfo="none">smbpasswd</command> by default connects to the 47 <emphasis>localhost - 127.0.0.1</emphasis> address as an SMB client to issue the password change request. If 48 <smbconfoption name="bind interfaces only"/> is set then unless the network address 49 <emphasis>127.0.0.1</emphasis> is added to the <smbconfoption name="interfaces"/> parameter list then <command 50 moreinfo="none"> smbpasswd</command> will fail to connect in it's default mode. <command 51 moreinfo="none">smbpasswd</command> can be forced to use the primary IP interface of the local host by using 52 its <citerefentry><refentrytitle>smbpasswd</refentrytitle> <manvolnum>8</manvolnum></citerefentry> <parameter 53 moreinfo="none">-r <replaceable>remote machine</replaceable></parameter> parameter, with <replaceable>remote 54 machine</replaceable> set to the IP name of the primary interface of the local host. 55 </para> 56 57 <para> 58 The <command moreinfo="none">swat</command> status page tries to connect with <command 59 moreinfo="none">smbd</command> and <command moreinfo="none">nmbd</command> at the address 60 <emphasis>127.0.0.1</emphasis> to determine if they are running. Not adding <emphasis>127.0.0.1</emphasis> 61 will cause <command moreinfo="none"> smbd</command> and <command moreinfo="none">nmbd</command> to always show 62 "not running" even if they really are. This can prevent <command moreinfo="none"> swat</command> 63 from starting/stopping/restarting <command moreinfo="none">smbd</command> and <command 64 moreinfo="none">nmbd</command>. 65 </para> 66 67</description> 68<value type="default">no</value> 69</samba:parameter> 70