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Minor fixes to wireshark documentation

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* the goal is to make the documentation more procedural and
  descriptive and easier to understand
* added missing info in RLC-NR about reassembling of AM frames
This commit is contained in:
Guido Casati
2024-06-17 18:31:25 +02:00
parent 9fab212441
commit dbc84d91fc
1 changed files with 31 additions and 25 deletions
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common/utils/T/DOC/T/wireshark.md
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@@ -99,46 +99,52 @@ Use a recent version of wireshark. The steps below were done using
version 3.3.2. Maybe some options are different for your version
of wireshark. Adapt as necessary.
First, do the previous steps for LTE.
1) First, do the previous steps for LTE.
2) Then, in the menu, choose `Edit->Preferences`.
3) In the preference window, unroll `Protocols` and configure the following:
Then, in the menu, choose `Edit->Preferences`.
**MAC**
In the preference window, unroll `Protocols`.
Go to `MAC-NR`. Select:
Go to `MAC-NR`. Select both options (`Attempt to decode BCCH, PCCH and CCCH data using NR RRC dissector`
and `Attempt to dissect LCID 1-3 as srb1-3`).
* `Attempt to decode BCCH, PCCH and CCCH data using NR RRC dissector`
* `Attempt to dissect LCID 1-3 as srb1-3`
For `Source of LCID -> drb channel settings` choose option `From static table`.
Then click the `Edit...` button of `LCID -> DRB Mappings Table`.
In the new window, click on `+`. Choose LCID `4`, DRBID `1`, UL RLC Bearer
For `Source of LCID -> drb channel settings`:
* choose option `From static table`.
* click the `Edit...` button of `LCID -> DRB Mappings Table`.
* In the new window, click on `+`. Choose LCID `4`, DRBID `1`, UL RLC Bearer
Type `AM, SN Len=18`, same thing for DL RLC Bearer Type.
* Click OK.
Then click OK.
**RLC**
Now, go to `RLC-NR`. Select `Call PDCP dissector for SRB PDUs`.
Now, go to `RLC-NR`. Select:
For `Call PDCP dissector for UL DRB PDUs` choose `18-bit SN`. Same
for DL.
Select `Call RRC dissector for CCCH PDUs`.
* `Call PDCP dissector for SRB PDUs`.
* `Call PDCP dissector for UL DRB PDUs` choose `18-bit SN`. Same for DL.
* `Call RRC dissector for CCCH PDUs`.
* `Try to reassemble AM frames`.
You don't need to select `May see RLC headers only` and
`Try to reassemble UM frames`.
Now, go to `PDCP-NR`. Select what you want in there. It's good
to select `Show uncompressed User-Plane data as IP`. Also good
to select `Show unciphered Signalling-Plane data as RRC`.
For `Do sequence number analysis` it can be good to use
`Only-RLC-frames` but anything will do. We don't use ROHC so you
don't need to select `Attempt to decode ROHC data`. And the
layer info to show depends on what you want to analyse.
`Traffic Info` is a good choice.
**PDCP**
Now, go to `PDCP-NR`. Select what you need in there.
It's good to select:
* `Show uncompressed User-Plane data as IP`
* `Show unciphered Signalling-Plane data as RRC`.
* `Only-RLC-frames` in `Do sequence number analysis`, but anything will do.
* `Traffic Info` as layer info to show, depending on what you want to analyse.
We don't use ROHC so you don't need to select `Attempt to decode ROHC data`.
You are done with the preferences. You can click OK.
Then, in the menu `Analyze`, choose `Enabled Protocols...`. In the new window
search for `nr` and select `mac_nr_udp` to have `MAC-NR over UDP`.
4) Then, in the menu `Analyze`, choose `Enabled Protocols...`.
5) In the new window search for `nr` and select `mac_nr_udp` to have `MAC-NR over UDP`.
And that's it. Maybe other settings can be changed, but those steps should be
enough for a start.