NetBIOS Session Service (NBSS)

The NetBIOS Session Service is part of the NetBIOS-over-TCP protocol suite, see the NetBIOS page for further information.


XXX - add a brief description of NBSS history

Protocol dependencies

  • TCP: NBSS uses TCP as its transport protocol. The well known TCP port for NBSS traffic is 139.

Example traffic

XXX - Add example traffic here (as plain text or Wireshark screenshot).


The NBSS dissector is fully functional.

Preference Settings

(XXX add links to preference settings affecting how NBSS is dissected).

Example capture file

XXX - Add a simple example capture file to the SampleCaptures page and link from here. Keep it short, it's also a good idea to gzip it to make it even smaller, as Wireshark can open gzipped files automatically.

Display Filter

A complete list of NBSS display filter fields can be found in the display filter reference

Show only the NBSS based traffic:


Capture Filter

You cannot directly filter NBSS while capturing. However, as it runs atop TCP port 139, you can filter on that one.

Capture NBSS traffic:

 tcp port 139 

External links

  • RFC1001 Protocol Standard For a NetBIOS Service on a TCP/UDP Transport: Concepts and Methods

  • RFC1002 Protocol Standard For a NetBIOS Service on a TCP/UDP Transport: Detailed Specifications


Imported from on 2020-08-11 23:17:13 UTC