When the AMF is terminated, this AMF sends the AMFStatusIndication NGAP message.
Why does the AMF send this packets?
Frame 160836: 82 bytes on wire (656 bits), 82 bytes captured (656 bits) on interface -, id 0
Interface id: 0 (-)
Interface name: -
Encapsulation type: Ethernet (1)
Arrival Time: Apr 27, 2021 17:00:55.447387000 東京 (標準時)
[Time shift for this packet: 0.000000000 seconds]
Epoch Time: 1619510455.447387000 seconds
[Time delta from previous captured frame: 0.000316000 seconds]
[Time delta from previous displayed frame: 7.172305000 seconds]
[Time since reference or first frame: 20349.702227000 seconds]
Frame Number: 160836
Frame Length: 82 bytes (656 bits)
Capture Length: 82 bytes (656 bits)
[Frame is marked: False]
[Frame is ignored: False]
[Protocols in frame: eth:ethertype:ip:sctp:ngap:ngap]
Ethernet II, Src: 00:00:00_00:00:00 (00:00:00:00:00:00), Dst: 00:00:00_00:00:00 (00:00:00:00:00:00)
Destination: 00:00:00_00:00:00 (00:00:00:00:00:00)
Address: 00:00:00_00:00:00 (00:00:00:00:00:00)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
Source: 00:00:00_00:00:00 (00:00:00:00:00:00)
Address: 00:00:00_00:00:00 (00:00:00:00:00:00)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
Type: IPv4 (0x0800)
Internet Protocol Version 4, Src: 127.0.0.1, Dst: 127.0.0.1
0100 .... = Version: 4
.... 0101 = Header Length: 20 bytes (5)
Differentiated Services Field: 0x02 (DSCP: CS0, ECN: ECT(0))
0000 00.. = Differentiated Services Codepoint: Default (0)
.... ..10 = Explicit Congestion Notification: ECN-Capable Transport codepoint '10' (2)
Total Length: 68
Identification: 0x04f6 (1270)
Flags: 0x4000, Don't fragment
0... .... .... .... = Reserved bit: Not set
.1.. .... .... .... = Don't fragment: Set
..0. .... .... .... = More fragments: Not set
Fragment offset: 0
Time to live: 64
Protocol: SCTP (132)
Header checksum: 0x373c [correct]
[Header checksum status: Good]
[Calculated Checksum: 0x373c]
Source: 127.0.0.1
Destination: 127.0.0.1
Stream Control Transmission Protocol, Src Port: 38412 (38412), Dst Port: 44090 (44090)
Source port: 38412
Destination port: 44090
Verification tag: 0x7ceaf1da
[Association index: 65535]
Checksum: 0x00000000 [unverified]
[Checksum Status: Unverified]
DATA chunk(ordered, complete segment, TSN: 1684619727, SID: 0, SSN: 1, PPID: 60, payload length: 19 bytes)
Chunk type: DATA (0)
0... .... = Bit: Stop processing of the packet
.0.. .... = Bit: Do not report
Chunk flags: 0x03
.... 0... = I-Bit: Possibly delay SACK
.... .0.. = U-Bit: Ordered delivery
.... ..1. = B-Bit: First segment
.... ...1 = E-Bit: Last segment
Chunk length: 35
Transmission sequence number: 1684619727
[This TSN was retransmitted 1 time]
[This TSN was retransmitted in frame 160857 (0.101608000 seconds after this frame)]
[This chunk is acked in frame: 160858]
[The RTT to SACK was: 0.101640000 seconds]
Stream identifier: 0x0000
Stream sequence number: 1
Payload protocol identifier: NGAP (60)
Chunk padding: 00
NG Application Protocol
NGAP-PDU: initiatingMessage (0)
initiatingMessage
procedureCode: id-AMFStatusIndication (1)
criticality: ignore (1)
value
AMFStatusIndication
protocolIEs: 1 item
Item 0: id-UnavailableGUAMIList
ProtocolIE-Field
id: id-UnavailableGUAMIList (120)
criticality: reject (0)
value
UnavailableGUAMIList: 1 item
Item 0
UnavailableGUAMIItem
gUAMI
pLMNIdentity: 02f839
Mobile Country Code (MCC): France (208)
Mobile Network Code (MNC): Thales communications & Security (93)
aMFRegionID: ca [bit length 8, 1100 1010 decimal value 202]
aMFSetID: fe00 [bit length 10, 6 LSB pad bits, 1111 1110 00.. .... decimal value 1016]
aMFPointer: 00 [bit length 6, 2 LSB pad bits, 0000 00.. decimal value 0]