Huge thanks to our Platinum Members Endace and LiveAction,
and our Silver Member Veeam, for supporting the Wireshark Foundation and project.

Ethereal-users: [Ethereal-users] LUN==FFFF?

Note: This archive is from the project's previous web site, ethereal.com. This list is no longer active.

From: "ESQuicksall_Misc" <ESQuicksall_Misc@xxxxxxxxxxx>
Date: Wed, 16 Mar 2005 09:00:55 -0500
I am using 0.10.10. In the below packet, Ethereal shows the LUN to be 0xFFFF. But the PDU shows it to be 0. Why?

No. Time Source Destination Protocol Info Length Src port Dest port 23 13.465488 192.168.50.225 192.168.50.249 iSCSI SCSI: Test Unit Ready LUN: 0xffff 102 1088 3260

Frame 23 (102 bytes on wire, 102 bytes captured)
   Arrival Time: Mar 15, 2005 17:52:08.564982000
   Time delta from previous packet: 1.683908000 seconds
   Time since reference or first frame: 13.465488000 seconds
   Frame Number: 23
   Packet Length: 102 bytes
   Capture Length: 102 bytes
   Protocols in frame: eth:ip:tcp:iscsi
Ethernet II, Src: 00:c0:9f:29:70:6f, Dst: 00:e0:02:e3:13:a6
   Destination: 00:e0:02:e3:13:a6 (Crossroa_e3:13:a6)
   Source: 00:c0:9f:29:70:6f (QuantaCo_29:70:6f)
   Type: IP (0x0800)
Internet Protocol, Src Addr: 192.168.50.225 (192.168.50.225), Dst Addr: 192.168.50.249 (192.168.50.249)
   Version: 4
   Header length: 20 bytes
   Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00)
       0000 00.. = Differentiated Services Codepoint: Default (0x00)
       .... ..0. = ECN-Capable Transport (ECT): 0
       .... ...0 = ECN-CE: 0
   Total Length: 88
   Identification: 0x043d (1085)
   Flags: 0x04 (Don't Fragment)
       0... = Reserved bit: Not set
       .1.. = Don't fragment: Set
       ..0. = More fragments: Not set
   Fragment offset: 0
   Time to live: 128
   Protocol: TCP (0x06)
   Header checksum: 0x0000 (incorrect, should be 0x0f38)
   Source: 192.168.50.225 (192.168.50.225)
   Destination: 192.168.50.249 (192.168.50.249)
Transmission Control Protocol, Src Port: 1088 (1088), Dst Port: 3260 (3260), Seq: 3309122109, Ack: 2686484998, Len: 48
   Source port: 1088 (1088)
   Destination port: 3260 (3260)
   Sequence number: 3309122109
   Next sequence number: 3309122157
   Acknowledgement number: 2686484998
   Header length: 20 bytes
   Flags: 0x0018 (PSH, ACK)
       0... .... = Congestion Window Reduced (CWR): Not set
       .0.. .... = ECN-Echo: Not set
       ..0. .... = Urgent: Not set
       ...1 .... = Acknowledgment: Set
       .... 1... = Push: Set
       .... .0.. = Reset: Not set
       .... ..0. = Syn: Not set
       .... ...0 = Fin: Not set
   Window size: 64191
   Checksum: 0xe775 (incorrect, should be 0xa036)
iSCSI (SCSI Command)
   Opcode: SCSI Command (0x01)
   .0.. .... = I: Queued delivery
   Flags: 0x80
       1... .... = F: Final PDU in sequence
       .0.. .... = R: No data will be read from target
       ..0. .... = W: No data will be written to target
       .... .000 = Attr: Untagged (0x00)
   TotalAHSLength: 0x00
   DataSegmentLength: 0x00000000
   LUN: 0000000000000000
   InitiatorTaskTag: 0x00000074
   ExpectedDataTransferLength: 0x00000000
   CmdSN: 0x00000074
   ExpStatSN: 0x00000075
SCSI CDB
   LUN: 0xffff
   Opcode: Test Unit Ready (0x00)
   Vendor Unique = 0, NACA = 0, Link = 0

0000  00 e0 02 e3 13 a6 00 c0 9f 29 70 6f 08 00 45 00   .........)po..E.
0010  00 58 04 3d 40 00 80 06 00 00 c0 a8 32 e1 c0 a8   [email protected]...
0020  32 f9 04 40 0c bc c5 3d 32 3d a0 20 82 06 50 18   2..@...=2=. ..P.
0030  fa bf e7 75 00 00 01 80 00 00 00 00 00 00 00 00   ...u............
0040  00 00 00 00 00 00 00 00 00 74 00 00 00 00 00 00   .........t......
0050  00 74 00 00 00 75 00 00 00 00 00 00 00 00 00 00   .t...u..........
0060  00 00 00 00 00 00                                 ......