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What ports must I enable to let NBT (NetBios over TCP/IP) through my firewall
Computing Security,Information Security, NT security, Web Security and Network Security Questions and Answers
(Continued from previous question...)
What ports must I enable to let NBT (NetBios over TCP/IP) through my firewall
First of all, you should really, really reconsider if this is such a good idea to let NBT traffic through your firewall. Especially if the firewall is between your internal network and Internet.
The problem with NBT is that at once you open it up through the firewall, people will have potential access to all NetBios services, not just a selection of them, such as printing.
The following is a list of the ports used by NBT.
* netbios-ns 137/tcp NETBIOS Name Service
* netbios-ns 137/udp NETBIOS Name Service
* netbios-dgm 138/tcp NETBIOS Datagram Service
* netbios-dgm 138/udp NETBIOS Datagram Service
* netbios-ssn 139/tcp NETBIOS Session Service
* netbios-ssn 139/udp NETBIOS Session Service
(Continued on next question...)
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