Wireshark currently can't capture raw X.25 packets as there's no support for that in libpcap/WinPcap.
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
- The X.25 Packet Layer Protocol is transported atop LAPB (Link Access Protocol-B), or atop XOT (X.25-over-TCP).
XXX - Add example traffic here (as plain text or Wireshark screenshot).
The X.25 dissector is fully functional.
- If CALL REQUEST not seen or didn't specify protocol, dissect as QLLC/SNA. Default: FALSE
- If CALL REQUEST has no data, assume the protocol handled is COTP. Default: FALSE
- If CALL REQUEST not seen or didn't specify protocol, check user data before checking heuristic dissectors. Default: FALSE
- Reassemble fragmented X.25 packets. Default: TRUE
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.
A complete list of X.25 display filter fields can be found in the display filter reference for X.25.
Show only the X.25-based traffic:
As Wireshark doesn't support capturing X.25 traffic, there are no capture filters for it.
X.25 Networking Guide Far
X.25 chapter from Cisco's Internetworking Technology Handbook
X.25 at Wikipedia.org
RFC 1613 X.25-over-TCP
Imported from https://wiki.wireshark.org/X.25 on 2020-08-11 23:27:45 UTC