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EAP-5G decoding issue for NWu interface(Ue and N3IWF) for 5G wifi calling

asked 2022-04-06 22:34:37 +0000

updated 2022-04-07 08:16:27 +0000

grahamb gravatar image

Hi Interface: NWu Entities; UE and N3IWF

In 5G for vowifi Standalone solution N3IWF is introcuded which is enhancement of epdg in 4G.

EAP is enhanced to have EAP 5G-start flow whenever IKE_AUTH is received without authentication payload.

Wireshark is not decoding this EAP section within the IKE session

Internet Security Association and Key Management Protocol
    Initiator SPI: f431f77100000000
    Responder SPI: ba2aa92d8af41601
    Next payload: Identification - Responder (36)
    Version: 2.0
    Exchange type: IKE_AUTH (35)
    Flags: 0x20 (Responder, No higher version, Response)
    Message ID: 0x00000001
    Length: 97
    Payload: Identification - Responder (36)
        Next payload: Extensible Authentication (48)
        0... .... = Critical Bit: Not critical
        .000 0000 = Reserved: 0x00
        Payload length: 51
        ID type: FQDN (2)
        Reserved: 000000
        Identification Data:n3iwf.epc.mncxxx.mccxxx.pub.3gppnetwork.org
    Payload: Extensible Authentication (48)
        Next payload: NONE / No Next Payload  (0)
        0... .... = Critical Bit: Not critical
        .000 0000 = Reserved: 0x00
        Payload length: 18
        Extensible Authentication Protocol
            Code: Request (1)
            Id: 0
            Length: 14
            Type: Expanded Type (254)
            Expanded Type
                EAP-EXT Vendor Id: Unknown (0x28af)
                EAP-EXT Vendor Type: Unknown (0x03)
                Data (2 bytes)
                    **Data: 0100**
                    [Length: 2]
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answered 2022-04-07 09:53:53 +0000

Jaap gravatar image

If you would like to see this added to Wireshark you could either see if you can create the required update yourself and create a merge request on the Wireshark project on GitLab, or you could open an issue on the Wireshark project on GitLab, providing all these details and most importantly an exampe capture file to test with. Then maybe someone will pick this up and implement it for you.

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Asked: 2022-04-06 22:34:37 +0000

Seen: 35 times

Last updated: Apr 07