Teledyne LeCroy FireInspector - Users Manual - Manual (Page 78)

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CATC F IRE I NSPECTOR 2.01 C HAPTER 5
User’s ManualCATC Trace Fil es
• Datagram: contains the fields of the 1394 encapsulation header.
• ARP: contains the fields of the 1394 encapsulation header plus the ARP fields.
• MCAP: contains the fields of the 1394 encapsulation header plus the MCAP fields.
Internet Protocol Datagrams (IPDG or IP Datagrams)
Internet Protocol Datagrams are composed of one or more IPv4/1394 transactions.
FireInspector's IP Datagram decoder displays the datagram header fields and finds the
IPv4/1394 transactions that make up the IPDG and groups them together in the Trace.
View Type Fields in IPDG Transaction Rows
The DG Header fields in IPDG transaction rows contain a View Fields command that allows
you to see the contents of the data structures.
Left-click* on the field header to access the cell context menu, which contains the View
Fields commands. Selecting the command opens a View Fields dialog, which contains the
data laid out according to the IPDG specification.
*If the option Right click cell context menu is checked on the General tab of the Display Options dialog,
then the cell context menu is opened by right-clicking. See Section 5.1.1, “General Display Options” on
page 42 for more information.
Table 5-8: Fields in IPDG transaction rows
Field Headings Description
DG Header This field is expandable and collapsible to show and hide more IP
datagram header fields.
Ver The value of the Version field in the IPDG header.
IHL The value of the IHL (Internet Header Length) field in the IPDG
header.
TOS The value of the TOS (Type of Service) field in the IPDG header.
Length The value of the Total Length field in the IPDG header.
id The value of the Identification field in the IPDG header.
Flags The value, in hexadecimal, of the 3-bit Flags field in the IPDG header.
Value Bit 0 Bit 1 (DF) Bit 2 (MF) Meaning
0 0 0 0 Last fragment
1 0 0 1 More fragments
2 0 1 0 Don’t fragment
Offset The value of the Fragment Offset field in the IPDG header.
TTL The value of the TTL (Time to Live) field in the IPDG header.
Protocol The value of the Protocol field in the IPDG header.
HCS The value of the Header Checksum field in the IPDG header.
Source IP The value of the Source Address field in the IPDG header.
Dest IP The value of the Destination Address field in the IPDG header.
Data The Data field can be expanded and collapsed. By default, it is
collapsed, and the value shown is the amount of data contained in the
datagram. When expanded, the actual data from the field is shown.