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I found that in my wlan-capture file. Expert Info (Note/Undecoded): Dissector for 802.11 IE Tag (20/40 BSS Intolerant Channel Report) code not implemented.Could you tell me what is happening?

asked 2019-10-04 09:49:02 +0000

updated 2019-10-04 10:36:15 +0000

grahamb gravatar image

The packet:

No.   Time       Source            Destination       Protocol Length Info
32831 482.304116 LiteonTe_77:86:19 AvmAudio_83:60:1c 802.11   37     Action, SN=260, FN=0, Flags=........

Frame 32831: 37 bytes on wire (296 bits), 37 bytes captured (296 bits)
    Encapsulation type: IEEE 802.11 Wireless LAN (20)
    Arrival Time: Oct  4, 2019 11:02:39.319725000 Mitteleuropäische Sommerzeit
    [Time shift for this packet: 0.000000000 seconds]
    Epoch Time: 1570179759.319725000 seconds
    [Time delta from previous captured frame: 0.002467000 seconds]
    [Time delta from previous displayed frame: 0.002467000 seconds]
    [Time since reference or first frame: 482.304116000 seconds]
    Frame Number: 32831
    Frame Length: 37 bytes (296 bits)
    Capture Length: 37 bytes (296 bits)
    [Frame is marked: False]
    [Frame is ignored: False]
    [Protocols in frame: wlan]
IEEE 802.11 Action, Flags: ........
    Type/Subtype: Action (0x000d)
    Frame Control Field: 0xd000
    .000 0001 0011 1010 = Duration: 314 microseconds
    Receiver address: AvmAudio_83:60:1c (5c:49:79:83:60:1c)
    Destination address: AvmAudio_83:60:1c (5c:49:79:83:60:1c)
    Transmitter address: LiteonTe_77:86:19 (00:f4:8d:77:86:19)
    Source address: LiteonTe_77:86:19 (00:f4:8d:77:86:19)
    BSS Id: AvmAudio_83:60:1c (5c:49:79:83:60:1c)
    .... .... .... 0000 = Fragment number: 0
    0001 0000 0100 .... = Sequence number: 260
IEEE 802.11 wireless LAN
    Fixed parameters
    Tagged parameters (11 bytes)
        Tag: 20/40 BSS Coexistence
            Tag Number: 20/40 BSS Coexistence (72)
            Tag length: 1
            20/40 BSS Coexistence Flags: 0x00
        Tag: 20/40 BSS Intolerant Channel Report: Undecoded
            Tag Number: 20/40 BSS Intolerant Channel Report (73)
                [Expert Info (Note/Undecoded): Dissector for 802.11 IE Tag (20/40 BSS Intolerant Channel Report) code not implemented, Contact Wireshark developers if you want this supported]
                    [Dissector for 802.11 IE Tag (20/40 BSS Intolerant Channel Report) code not implemented, Contact Wireshark developers if you want this supported]
                    [Severity level: Note]
                    [Group: Undecoded]
            Tag length: 6
            Tag Data: 000106080b0d
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answered 2019-10-04 19:20:33 +0000

Jaap gravatar image

Like Anders said, Wireshark does not get dissect this IE.

If you want it dissected the best thing is to open a bug report and add:

  • A reference to the standard where this IE is defined
  • A capture file (not a screenshot, or text dump) containing packet(s) with this IE

Or you can program the extension yourself and submit it for inclusion.

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answered 2019-10-04 12:07:41 +0000

Anders gravatar image

Wireshark does not yet dissect this IE.

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Asked: 2019-10-04 09:49:02 +0000

Seen: 47 times

Last updated: Oct 04