= Wireshark integration =

[http://www.wireshark.org/ wireshark] is a popular Open Source protocol analyzer. Among many
other protocols, it includes dissectors for the GSM Layer 2 (LAPDm) and 3 (04.08).

There also is a GSMTAP protocol dissector (not in wireshark mainline yet submitted as [https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=4508 wireshark bug 4508], available in our
git repository in {{{src/wireshark/gsmtap.patch}}}), which allows real-time capture and
decode of GSM protocol messages encapsulated in GSMTAP (which is in turn encapsulated
in UDP and IP).

So if you have a wireshark version with GSMTAP support, you can have realtime decode and
trace of GSM protocol messages.

The OsmocomBB [wiki:layer23] program sends GSMTAP packets to the localhost (127.0.0.1) address
of the loopback interface (lo).

Image(gsmtap-wireshark.png, 66%)