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# ISO 8823/X.226 OSI PRESENTATION PROTOCOL (PRES)
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This protocol is defined as [ISO](/ISO) standard 8823 and [ITU-T](/ITU-T) recommendation X.226.
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It is part of the [IsoProtocolFamily](/IsoProtocolFamily).
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## History
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This protocol is part of the OSI stack.
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## Protocol dependencies
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- See [IsoProtocolFamily](/IsoProtocolFamily) for protocol dependencies
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## Example traffic
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XXX - Add example traffic here (as plain text or Wireshark screenshot).
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## Wireshark
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The PRES dissector is generated by the [Asn2wrs](/Asn2wrs) compiler.
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## Preference Settings
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(XXX add links to preference settings affecting how PRES is dissected).
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## Example capture file
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XXX - Add a simple example capture file to the [SampleCaptures](/SampleCaptures) page and link from here (see below). Keep this file short, it's also a good idea to gzip it to make it even smaller, as Wireshark can open gzipped files automatically.
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- [SampleCaptures/PROTO.pcap](uploads/__moin_import__/attachments/SampleCaptures/PROTO.pcap)
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## Display Filter
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A complete list of PRES display filter fields can be found in the [display filter reference](http://www.wireshark.org/docs/dfref/p/pres.html)
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Show only the PRES based traffic:
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```
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pres
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```
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## Capture Filter
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You cannot directly filter PRES protocols while capturing.
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## External links
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\* <http://www.itu.int/ITU-T/asn1/database/itu-t/x/x226/index.html> ITU PRES page.
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## Discussion
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---
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Imported from https://wiki.wireshark.org/PRES on 2020-08-11 23:18:19 UTC |