[srslte-users] SCTP ASCONF && Missing implementation?

[Roderick Groesbeek]

Hi People,

I'm trying to connect srsenb to an Aricent/Altran EPC.
But it fails in the MME communication, see below.

Is this something that is deliberately not coped with in srsenb?
Could/Should I hack the support for it in the source code? (if so, any kickstart hints?)




According to https://tools.ietf.org/html/rfc5061#page-5
this must be acknowledged.

RFC 5061 - Stream Control Transmission Protocol (SCTP) Dynamic Address Reconfiguration - Internet Engineering Task Force<https://tools.ietf.org/html/rfc5061#page-5>
RFC 5061 SCTP Dynamic Address Reconfiguration September 2007 1.Introduction A local host may have multiple points of attachment to the Internet, giving it a degree of fault tolerance from hardware failures. SCTP was developed to take full advantage of such a multi-homed host to provide a fast failover and association survivability in the face of such hardware failures.
tools.ietf.org



31 2.786994261 192.168.0.52 100.100.100.220 SCTP 84 INIT
33 2.797602863 100.100.100.220 192.168.0.52 SCTP 952 INIT_ACK
34 2.797652779 192.168.0.52 100.100.100.220 SCTP 916 COOKIE_ECHO
35 2.809712390 100.100.100.220 192.168.0.52 SCTP 62 COOKIE_ACK
36 2.809956541 192.168.0.52 100.100.100.220 S1AP 116 S1SetupRequest
37 2.809976818 100.100.100.220 192.168.0.52 SCTP 80 ASCONF
Frame 37: 80 bytes on wire (640 bits), 80 bytes captured (640 bits) on interface 0
Linux cooked capture
Internet Protocol Version 4, Src: 100.100.100.220, Dst: 192.168.0.52
Stream Control Transmission Protocol, Src Port: 36412 (36412), Dst Port: 57401 (57401)
    Source port: 36412
    Destination port: 57401
    Verification tag: 0x7737b667
    [Association index: 0]
    Checksum: 0xa5a539b0 [unverified]
    [Checksum Status: Unverified]
    ASCONF chunk
        Chunk type: ASCONF (193)
        Chunk flags: 0x00
        Chunk length: 32
        Sequence number: 0x414bc735
        IPv4 address parameter (Address: 100.100.100.220)
            Parameter type: IPv4 address (0x0005)
            Parameter length: 8
            IP Version 4 address: 100.100.100.220
        Set primary address parameter (Address: 100.100.100.220, correlation ID: 0)
            Parameter type: Set primary address (0xc004)
            Parameter length: 16
            Correlation_id: 0x00000000
            IPv4 address parameter (Address: 100.100.100.220)
                Parameter type: IPv4 address (0x0005)
                Parameter length: 8
                IP Version 4 address: 100.100.100.220


38 2.809988052 192.168.0.52 100.100.100.220 SCTP 88 ERROR

Frame 38: 88 bytes on wire (704 bits), 88 bytes captured (704 bits) on interface 0
Linux cooked capture
Internet Protocol Version 4, Src: 192.168.0.52, Dst: 100.100.100.220
Stream Control Transmission Protocol, Src Port: 57401 (57401), Dst Port: 36412 (36412)
    Source port: 57401
    Destination port: 36412
    Verification tag: 0x414bc735
    [Association index: 0]
    Checksum: 0xea569815 [unverified]
    [Checksum Status: Unverified]
    ERROR chunk
        Chunk type: ERROR (9)
        Chunk flags: 0x00
        Chunk length: 40
        Unrecognized chunk type cause (Type: 193 (ASCONF))
            Cause code: Unrecognized chunk type (0x0006)
            Cause length: 36
            ASCONF chunk
                Chunk type: ASCONF (193)
                Chunk flags: 0x00
                Chunk length: 32
                Sequence number: 0x414bc735
                IPv4 address parameter (Address: 100.100.100.220)
                    Parameter type: IPv4 address (0x0005)
                    Parameter length: 8
                    IP Version 4 address: 100.100.100.220
                Set primary address parameter (Address: 100.100.100.220, correlation ID: 0)
                    Parameter type: Set primary address (0xc004)
                    Parameter length: 16
                    Correlation_id: 0x00000000
                    IPv4 address parameter (Address: 100.100.100.220)
                        Parameter type: IPv4 address (0x0005)
                        Parameter length: 8
                        IP Version 4 address: 100.100.100.220

39 2.820425679 100.100.100.220 192.168.0.52 S1AP 92 S1SetupFailure [Misc-cause=unspecified]
40 2.820471379 192.168.0.52 100.100.100.220 SCTP 64 SACK
41 2.820692627 100.100.100.220 192.168.0.52 SCTP 62 ABORT
42 2.830521878 100.100.100.220 192.168.0.52 SCTP 62 ABORT

Thnx!


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