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Much of the IP, TCP and UDP header information is parsed and displayed behind
appropriate titles. This includes the source and destination IP addresses, length of
the complete IP datagram, the type of service (TOS), source and destination ports,
and acknowledgment (ACK) numbers. This information should help you debug the
problem that you are having with TCP/IP on this AS/400 or in the network which this
AS/400 is part of.
Additional Information on TCP/IP Communications Trace
The following documentation might help you to further debug a problem.
v The V2R3 TCP/IP Redbook,
IBM AS/400 TCP/IP Configuration and Operation
,
GG24-3442, contains an appendix that breaks down traces for TN5250, VT100
server, VT220 client TN3270 server, SMTP server, LPR client, and FTP server.
The formatting of the TCP/IP communication traces may have changed, but for
the most part the protocol that flows between the AS/400 and the remote host
should be the same.
v Another book from the ITSO that would be helpful to those wanting to analyze
TCP/IP communications traces would be the
TCP/IP Tutorial and Technical
Overview
, GG24-3376.
Using the Product Activity Log for TCP/IP Problem Analysis
The TCP/IP LIC code creates an entry in the Product Activity Log whenever a
TCP/IP datagram is discarded because of a protocol error.
For outbound TCP/IP datagrams, an example of such a protocol error is a failure to
establish an X.25 connection over which the datagram was to be sent. In this case,
an error is reported to the user and the outbound datagram is discarded.
Inbound datagrams cause an entry in the Product Activity Log to be created when
both of these conditions are met:
v The Log Protocol Errors TCP/IP Attribute is set to *YES
Display Spooled File
File .....: QTCPPRT Page/Line 3/1
Control..... Columns 1 - 78
Find ......
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+...
COMMUNICATIONS TRACE Title: TCP/IP TRACE 04/08/97
Record Data Record Controller Destination Source
Number S/R Length Timer Name MAC Address MAC Address
------ --- ------ --------------- ---------- ------------ -----------
7 R 537 10:10:35.79229 FFFFFFFFFFFF C0001F02A
Routing Info . : C63099019610
Frame Type : IP TOS: NORMAL Lengt
Src Addr:10.7.9.1 Dest Addr:
SNAP Header: 0000000800
IP Header : 450002142A0A000001116B46090508010905087F
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F3=Exit F12=Cancel F19=Left F20=Right F24=More keys
Chapter 21. TCP/IP Problem Analysis
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