X.25
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X.25 was standardized by the CCITT and later by the ITU-T and is obsolete right now.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 ...
History
XXX - add a brief description of X.25 history
Protocol dependencies
- The X.25 Packet Layer Protocol is transported atop LAPB (Link Access Protocol-B), or atop XOT (X.25-over-TCP).
Example traffic
XXX - Add example traffic here (as plain text or Wireshark screenshot).
Wireshark
The X.25 dissector is fully functional.
Preference Settings
- 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
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.
Show only the X.25-based traffic:
x.25 Capture Filter
As Wireshark doesn't support capturing X.25 traffic, there are no capture filters for it.
External links
-
X.25 Networking Guide Far
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X.25 chapter from Cisco's Internetworking Technology Handbook
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X.25 at Wikipedia.org
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RFC 1613 X.25-over-TCP
Discussion
Imported from https://wiki.wireshark.org/X.25 on 2020-08-11 23:27:45 UTC