Wireshark currently can't capture raw X.25 packets as there's no support for that in libpcap/WinPcap.

It can, however, dissect X.25 traffic captured by some other network analyzers and X.25 packets transported over XOT (RFC 1613).

X.25 was standardized by the CCITT and later by the ITU-T and is obsolete right now.

X.25 provides services to deliver data packets (layer 2 and 3 in the OSI model) over serial lines. (XXX - split into LAPB and X.25 Packet Layer Protocol?)

Anyone with more knowledge about X.25 might continue here ...


XXX - add a brief description of X.25 history

Protocol dependencies

Example traffic

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


The X.25 dissector is fully functional.

Preference Settings

Example capture file

XXX - Add a simple example capture file. 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 X.25 display filter fields can be found in the display filter reference for X.25.

Capture Filter


X.25 (last edited 2010-10-17 18:59:55 by GuyHarris)