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Ports required for Netbios

A

AluminumStudios

Senior member
What are the minimal ports that need to be open to access a Windows machine's shares via netbios?

I've heard TCP 137-139 and UDP 137-139 as well as tcp 135. Which ports are absolutely required? If I had a firewalled Windows machine and only allowed traffic on TCP/139, could another windows machine access it shares?

Before you all yell at me about how insecure Netbios is, this isn't going to be open to Internet traffic. This is on an intranet.
 
If it's on an Intranet, why the concern? I believe that 135, 137-139, and 445 are the complete list. I don't know if a subset of those will work, but it's pretty easy for you to try it I would imagine.
 
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