P.S. Wireshark dump: No. Time Source Destination Protocol Length Info otid dtid Type Session 1 0.000000 10.255.106.145 10.25.94.114 SCTP 156 INIT Frame 1: 156 bytes on wire (1248 bits), 156 bytes captured (1248 bits) Linux cooked capture v1 Internet Protocol Version 4, Src: 10.255.106.145 (10.255.106.145), Dst: 10.25.94.114 (10.25.94.114) Stream Control Transmission Protocol, Src Port: 49139 (49139), Dst Port: 3875 (3875) Source port: 49139 Destination port: 3875 Verification tag: 0x00000000 [Association index: disabled (enable in preferences)] Checksum: 0x98d014aa [unverified] [Checksum Status: Unverified] INIT chunk (Outbound streams: 8, inbound streams: 8) Chunk type: INIT (1) Chunk flags: 0x00 Chunk length: 108 Initiate tag: 0x7ff58ed1 Advertised receiver window credit (a_rwnd): 1000000 Number of outbound streams: 8 Number of inbound streams: 8 Initial TSN: 457141724 IPv4 address parameter (Address: 10.255.106.209) IPv4 address parameter (Address: 10.255.106.145) Supported address types parameter (Supported types: IPv4) ECN parameter Supported Extensions parameter (Supported types: AUTH) Forward TSN supported parameter Random parameter Requested HMAC Algorithm parameter (Supported HMACs: SHA-1) Authenticated Chunk list parameter (Chunk types to be authenticated: ) No. Time Source Destination Protocol Length Info otid dtid Type Session 2 0.000059 10.25.94.122 10.255.106.145 SCTP 420 INIT_ACK Frame 2: 420 bytes on wire (3360 bits), 420 bytes captured (3360 bits) Linux cooked capture v1 Internet Protocol Version 4, Src: 10.25.94.122 (10.25.94.122), Dst: 10.255.106.145 (10.255.106.145) Stream Control Transmission Protocol, Src Port: 3875 (3875), Dst Port: 49139 (49139) Source port: 3875 Destination port: 49139 Verification tag: 0x7ff58ed1 [Association index: disabled (enable in preferences)] Checksum: 0x9df2bf8e [unverified] [Checksum Status: Unverified] INIT_ACK chunk (Outbound streams: 8, inbound streams: 8) Chunk type: INIT_ACK (2) Chunk flags: 0x00 Chunk length: 372 Initiate tag: 0xded810ed Advertised receiver window credit (a_rwnd): 212992 Number of outbound streams: 8 Number of inbound streams: 8 Initial TSN: 676475653 IPv4 address parameter (Address: 10.25.94.122) IPv4 address parameter (Address: 10.25.94.114) State cookie parameter (Cookie length: 324 bytes) ECN parameter Forward TSN supported parameter