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How to decode rlc-nr package

asked 2020-01-27 08:01:51 +0000

pingguoyuan gravatar image

updated 2020-01-27 08:05:53 +0000

I want to use DLT-user to decode RLC-NR data, but failed. It says 'can't dessect NR RLC frame because no per-frame info was attached. I know some parameters like sn length, am/um, but how can this info be told to wireshark?

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answered 2020-01-27 08:26:38 +0000

Pascal Quantin gravatar image

updated 2020-01-27 08:27:02 +0000

Hi, you need to use the UDP framing protocol described here so as to provide the dissector all the per-frame info. It measn that you cannot use a DLT user for this decoding.

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Can you share an example? Where should this infor attached? Before or after the frame?

pingguoyuan gravatar imagepingguoyuan ( 2020-01-27 08:46:40 +0000 )edit

The framing is explained in the header file link I shared, which should be self explanatory. Do you have any specific question after reading it?

Pascal Quantin gravatar imagePascal Quantin ( 2020-01-27 08:51:19 +0000 )edit

Sorry, i can not make it. Do i need to make a UDP head? if 'rlc_nr' is placed as a UDP payload, it is not decoded as rlc, If no UDP head exist, 'rlc-nr' is decoded to udp ports.

pingguoyuan gravatar imagepingguoyuan ( 2020-01-29 04:58:29 +0000 )edit

The framing protocol should be in the UDP payload. You must also activate the rlc_nr_udp heuristic dissector in the Analyze -> Enabled Protocols windows. Maybe that's what is missing here.

Pascal Quantin gravatar imagePascal Quantin ( 2020-01-29 06:14:33 +0000 )edit

so, what udp port should be use? any number?

pingguoyuan gravatar imagepingguoyuan ( 2020-01-29 06:18:59 +0000 )edit

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Asked: 2020-01-27 08:01:51 +0000

Seen: 2,582 times

Last updated: Jan 27 '20