samba - Mar 2001 - Impossible to obtain the NETBIOS name of a Win95 box using samba 2.0.5..0

Dear all,

I loose hope to be able to obtain the NETBIOS name of
a Win95 box using the following command :

nmblookup -A ipaddress

Some of my user are using laptops and are connecting
the network by a remote lan access.

The IP address is attributed by the RLA supplier.

I included in the login process (telnet) of our
Administrative AIX server a NETBIOS name check of the
calling machine. If the NETBIOS name if not in the
list of allowed boxes the server does not grant the
access.

If a Winnt box try to login, I don't have any issue.
But for Win95 !!!!

The version of Samba we use is 2.0.5.0.

Below a part of the smb.conf.

Thank for your reply,
Christophe.

-------------------smb.conf----------------------
workgroup = OR-UK-LON
netbios name = SRV10000C
local master = No
wins proxy = Yes
wins server = www.xxx.yyy.zzz





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On Fri, 30 Mar 2001 07:43:11 Christophe MAILHE wrote:
> 
> 
> Dear all,
> 
> I loose hope to be able to obtain the NETBIOS name of
> a Win95 box using the following command :
> 
> nmblookup -A ipaddress
Run nmblookup as root and see the -r switch in nmblookup(1)

   -r     Try and bind to UDP port 137 to  send  and  receive
          UDP  datagrams. The reason for this option is a bug
          in Windows 95 where it ignores the source  port  of
          the  requesting packet and only replies to UDP port
          137. Unfortunately, on most UNIX systems root priv-
          ilage  is needed to bind to this port, and in addi-
          tion, if  the  nmbd(8)daemon  is  running  on  this
          machine it also binds to this port.



Cheers, jerry
----------------------------------------------------------------------
   /\  Gerald (Jerry) Carter                     Professional Services
 \/    http://www.valinux.com/  VA Linux Systems   gcarter@valinux.com
       http://www.samba.org/       SAMBA Team          jerry@samba.org
       http://www.plainjoe.org/                     jerry@plainjoe.org

       "...a hundred billion castaways looking for a home."
                                - Sting "Message in a Bottle" ( 1979 )

Unfortunately with the 2.0.x code this will still not work for
Win9x clients if you have nmbd running on your machine. These
clients will only respond to port 137 (which was why you need
the -r flag) but if nmbd is running it has already bound to 
that port and will "eat" your answer so nmblookup will still
not see it. If you must use this and you still want browsing
to work on your machine (you cannot kill nmbd) then you will
have to rsh to another machine not running nmbd and run the
nmblookup command from there.

Gerald Carter wrote:
> 
> On Fri, 30 Mar 2001 07:43:11 Christophe MAILHE wrote:
> >
> >
> > Dear all,
> >
> > I loose hope to be able to obtain the NETBIOS name of
> > a Win95 box using the following command :
> >
> > nmblookup -A ipaddress
> 
> Run nmblookup as root and see the -r switch in nmblookup(1)
> 
>    -r     Try and bind to UDP port 137 to  send  and  receive
>           UDP  datagrams. The reason for this option is a bug
>           in Windows 95 where it ignores the source  port  of
>           the  requesting packet and only replies to UDP port
>           137. Unfortunately, on most UNIX systems root priv-
>           ilage  is needed to bind to this port, and in addi-
>           tion, if  the  nmbd(8)daemon  is  running  on  this
>           machine it also binds to this port.
-- 
=====================================================================Herb Lewis 
Silicon Graphics
Networking Engineer                      1600 Amphitheatre Pkwy MS-510
Strategic Software Organization          Mountain View, CA  94043-1351
herb@sgi.com                             Tel: 650-933-2177
http://www.sgi.com                       Fax: 650-932-2177          
======================================================================