UDP binding

[Pedro Corte-Real <typo@netcabo.pt>]

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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.

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