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NetBIOS traffic (internal) Firewall rules

Posted on 2006-07-20
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Last Modified: 2013-11-16
I've looked up the NetBIOS ports and what is used.  I've read through the RFC's, but I haven't been able to determine directionality.  Here is the general idea for what I am looking for.  If someone can provide all minimal firewall rules necessary for NetBIOS traffic to function, it would be greatly appreciated.  I am looking for traffic between workstation and server.

Thanks

Awakenings

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Question by:awakenings
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rsivanandan earned 350 total points
ID: 17146123
Most Part;

Port 135, 137-139 and 445 (Both UDP and TCP)

Allow them and should be okay.

Cheers,
Rajesh
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by:awakenings
ID: 17146244
Rajesh,

     But do I need them bidirectionally?  Can I minumize them for only outbound from workstation to server?  The ports are listed in ARIN and I can see the information you just provided.  I am looking for the minimum requirement between workstation and server.  What I am looking for is this;

Workstation tcp 135 outbound serever
Workstation udp 135 bidirectional server
Workstation tcp 137 outbound server.
etc.


    If you can provide this, it would be greatly appreciated.


Awakenings
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by:rsivanandan
rsivanandan earned 350 total points
ID: 17146399
Except for 135 (Wins I believe), all should be enabled towards the server.

Cheers,
Rajesh
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Assisted Solution

by:nttranbao
nttranbao earned 150 total points
ID: 17146648
Reference about the NETBIOS port security

http://www.nacs.uci.edu/security/netbios.html#what
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by:rsivanandan
ID: 17223459
thnx for the points, I hope you got the situation under control ?

Cheers,
Rajesh
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Author Comment

by:awakenings
ID: 17223707
Rajesh,

    Yes.  It took alot of research and analysis of existing rules to determine how things are supposed to be set up.

Awakenings
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by:rsivanandan
ID: 17223776
Ok. cool. One time job, pays off for future too :-)

Cheers,
Rajesh
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Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

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