Question: lower case NetBIOS names.

Christopher R. Hertel crh at
Wed Oct 5 09:14:19 MDT 2011


I have written a detailed description of the workings of NetBIOS over TCP
(NBT).  You can find it here:

In general, NetBIOS names are converted to upper case before use by the
underlying system.  This is not a requirement, but it is common practice.

DNS names and, therefore, hostnames are supposed to be compared "in a
case-insensitive manner".  Converting NetBIOS names to upper case produces
the same effect.

In general, it's not something you have to worry about.  The only time this
causes trouble is if an application fails to convert the NetBIOS name to
upper case before encoding it.  Such problems are rare, and I doubt you will
have any problems unless you are writing your own NBT implementation and
forget this step.

Let me know if that answers your question.

Chris -)-----

PS.  Note that you did send your query to the Samba-Technical mailing list,
     and not directly to me.  That's okay, it's appropriate for the list,
     but your message suggested that you intended to send directly to me.

Ibrahim, Mohammed (US - Hyderabad) wrote:
> Hi Christopher,
> I found your email id at,
> I've a concern that we require our NetBIOS, DNS and Hostnames in lower case, when I try to do this, it doesn't allow me to do. Would you like to put some light on it, so I get to know how I can be able to change it to lowercase.
> Should you need further info, please let me know.
> Thanks,
> -Ibrahim

"Implementing CIFS - the Common Internet FileSystem" ISBN: 013047116X
Samba Team --     -)-----   Christopher R. Hertel
jCIFS Team --   -)-----   ubiqx development, uninq.
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