[Samba] Right-way to use " bind interfaces only = Yes"?

[Rowland Penny]

On Sun, 22 Jun 2025 13:01:25 +0200
Gilles via samba <samba at lists.samba.org> wrote:

> Hello,
> 
> Is  "bind interfaces only = Yes" a good thing to use, and in that
> case, what's the right way to fix it 
> <https://askubuntu.com/questions/108040/samba-needs-additional-restart-on-reboot/349142#349142> 
> (on Debian)?
> 
> If I use it, Samba only listens to the loopback interface.
> 
> Thank you.
> 
> =============
> root at debian-dell:~# netstat -tunlp
> Active Internet connections (only servers)
> Proto Recv-Q Send-Q Local Address           Foreign Address  State
> PID/Program name
> tcp        0      0 127.0.0.1:445           0.0.0.0:*  LISTEN
> 396/smbd =============
> root at debian-dell:~# cat /etc/samba/smb.conf
> [global]
> netbios name = DEBIAN-DELL
> server role = standalone server
> security = user
> disable netbios = yes
> smb ports = 445
> 
> map to guest = Bad User
> guest account = www-data
> 
> ;interfaces = lo, enp4s0
> ;interfaces = 192.168.0.19/255.255.255.0 127.0.0.1/255.255.255.255
> interfaces = 192.168.0.19/24 127.0.0.1/32
> bind interfaces only = Yes
> =============
> vi smb.conf
> 
> [global]
> ...
> interfaces = 192.168.0.19/24 127.0.0.1/32
> ;bind interfaces only = Yes
> =============
> systemctl restart smbd
> =============
> root at debian-dell:/etc/samba# netstat -tunlp
> Active Internet connections (only servers)
> Proto Recv-Q Send-Q Local Address           Foreign Address  State
> PID/Program name
> tcp        0      0 0.0.0.0:445             0.0.0.0:*  LISTEN
> 515/smbd =============
> root at debian-dell:/etc/samba# cat /etc/init/smbd.conf
> cat: /etc/init/smbd.conf: No such file or directory
> root at debian-dell:/etc/samba# which smbd.conf
> root at debian-dell:/etc/samba#
> =============

From what you posted in your earlier post, this appears to be Samba
4.17.12, so probably Debian 12.

In which case, there is no /etc/init directory and there isn't a
smbd.conf file, it will be /etc/samba/smb.conf.

I do not think that reloading the Samba config will change the
interfaces for a running smbd, it binds to the interfaces at startup.

Can I suggest you stop using the default Debian Samba and use the
version from bookworm-backports, this will get you 4.22.2 at the moment
and that is supported by Samba, 4.17.12 is only supported by Debian and
as such isn't likely to get fixed if you have hit a bug, which is
unlikely.

'0.0.0.0' is not the loopback device.

'ifconfig' is deprecated, it has been replaced with 'ip a', what does
that show ?

Rowland