Re: UDP binding

[Nicholas Berry]

This is correct behaviour for Samba. It's not a security issue, since Samba isn't listening in any useable sense to interfaces other than those you request. You'll get 'connection refused' if you try to contact another interface.

Nik

>>> Pedro Corte-Real <[e-mail]> 10/22/01 02:23PM >>>
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> I am running samba on a machine with 2 outside interfaces. I want samba to
> listen only to one of them so I put these lines on smb.conf:

> bind interfaces only = True
> interfaces = 192.168.1.1 127.0.0.1

> These setings produce this in netstat -a:

> (...)
> udp        0      0 192.168.1.1:138         0.0.0.0:*
> udp        0      0 192.168.1.1:137         0.0.0.0:*
> udp        0      0 0.0.0.0:138             0.0.0.0:*
> udp        0      0 0.0.0.0:137             0.0.0.0:*
> (...)

> I was told this was because nmbd uses broadcast packets to do it's work and
> for it to listen to broadcast packages it must listen to 0.0.0.0. Is this
> true. Can't it bind to 192.168.1.0 instead?

> How does linux's interface binding API work? Is this really necessary?

> Greetings from Portugal,

> Pedro.