Клиент подтверждает и отправляет файл:
No. Time Source Destination Protocol Length Info
1170 145.454654 10.219.15.197 81.222.215.235 TCP 74 9448 > ftp-data [SYN, ACK] Seq=0 Ack=1 Win=8192 Len=0 MSS=1460 WS=256 SACK_PERM=1 TSval=11336273 TSecr=60511048
Frame 1170: 74 bytes on wire (592 bits), 74 bytes captured (592 bits)
Ethernet II, Src: Giga-Byt_0d:6f:1a (00:1f:d0:0d:6f:1a), Dst: Cadant_36:0a:01 (00:01:5c:36:0a:01)
Internet Protocol Version 4, Src: 10.219.15.197 (10.219.15.197), Dst: 81.222.215.235 (81.222.215.235)
Transmission Control Protocol, Src Port: 9448 (9448), Dst Port: ftp-data (20), Seq: 0, Ack: 1, Len: 0
Source port: 9448 (9448)
Destination port: ftp-data (20)
[Stream index: 29]
Sequence number: 0 (relative sequence number)
Acknowledgement number: 1 (relative ack number)
Header length: 40 bytes
Flags: 0x12 (SYN, ACK)
000. .... .... = Reserved: Not set
...0 .... .... = Nonce: Not set
.... 0... .... = Congestion Window Reduced (CWR): Not set
.... .0.. .... = ECN-Echo: Not set
.... ..0. .... = Urgent: Not set
.... ...1 .... = Acknowledgement: Set
.... .... 0... = Push: Not set
.... .... .0.. = Reset: Not set
.... .... ..1. = Syn: Set
.... .... ...0 = Fin: Not set
Window size value: 8192
[Calculated window size: 8192]
Checksum: 0x4498 [validation disabled]
Options: (20 bytes)
[SEQ/ACK analysis]
Сервер подтверждает получение файла (порты 21 и 9441):
No. Time Source Destination Protocol Length Info
1173 145.491232 81.222.215.235 10.219.15.197 FTP 76 Response: 150 Ok to send data.
Frame 1173: 76 bytes on wire (608 bits), 76 bytes captured (608 bits)
Ethernet II, Src: Cadant_36:0a:01 (00:01:5c:36:0a:01), Dst: Giga-Byt_0d:6f:1a (00:1f:d0:0d:6f:1a)
Internet Protocol Version 4, Src: 81.222.215.235 (81.222.215.235), Dst: 10.219.15.197 (10.219.15.197)
Transmission Control Protocol, Src Port: ftp (21), Dst Port: 9441 (9441), Seq: 53, Ack: 45, Len: 22
Source port: ftp (21)
Destination port: 9441 (9441)
[Stream index: 25]
Sequence number: 53 (relative sequence number)
[Next sequence number: 75 (relative sequence number)]
Acknowledgement number: 45 (relative ack number)
Header length: 20 bytes
Flags: 0x18 (PSH, ACK)
000. .... .... = Reserved: Not set
...0 .... .... = Nonce: Not set
.... 0... .... = Congestion Window Reduced (CWR): Not set
.... .0.. .... = ECN-Echo: Not set
.... ..0. .... = Urgent: Not set
.... ...1 .... = Acknowledgement: Set
.... .... 1... = Push: Set
.... .... .0.. = Reset: Not set
.... .... ..0. = Syn: Not set
.... .... ...0 = Fin: Not set
Window size value: 46
[Calculated window size: 46]
[Window size scaling factor: -1 (unknown)]
Checksum: 0xee98 [validation disabled]
[SEQ/ACK analysis]
File Transfer Protocol (FTP)
150 Ok to send data.\r\n
Response code: File status okay; about to open data connection (150)
Response arg: Ok to send data.
Далее происходит разрыв соединения между портами 20 и 9448 (флаги FIN и ACK):
No. Time Source Destination Protocol Length Info
1174 145.503663 10.219.15.197 81.222.215.235 TCP 66 9448 > ftp-data [FIN, ACK] Seq=1 Ack=1 Win=66560 Len=0 TSval=11336277 TSecr=60511050
Transmission Control Protocol, Src Port: 9448 (9448), Dst Port: ftp-data (20), Seq: 1, Ack: 1, Len: 0
Source port: 9448 (9448)
Destination port: ftp-data (20)
…
No. Time Source Destination Protocol Length Info
1175 145.529448 81.222.215.235 10.219.15.197 TCP 66 ftp-data > 9448 [FIN, ACK] Seq=1 Ack=2 Win=5888 Len=0 TSval=60511055 TSecr=11336277
Transmission Control Protocol, Src Port: ftp-data (20), Dst Port: 9448 (9448), Seq: 1, Ack: 2, Len: 0
Source port: ftp-data (20)
Destination port: 9448 (9448)
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