7.3 IBM i

IBM i

7.3

Networking

TCP/IP troubleshooting

IBM

Note

Before using this information and the product it supports, read the information in ¡°Notices¡± on page

71.

This edition applies to IBM i 7.3 (product number 5770-SS1) and to all subsequent releases and modifications until

otherwise indicated in new editions. This version does not run on all reduced instruction set computer (RISC) models nor

does it run on CISC models.

This document may contain references to Licensed Internal Code. Licensed Internal Code is Machine Code and is

licensed to you under the terms of the IBM License Agreement for Machine Code.

? Copyright International Business Machines Corporation 1997, 2015.

US Government Users Restricted Rights ¨C Use, duplication or disclosure restricted by GSA ADP Schedule Contract with

IBM Corp.

Contents

TCP/IP troubleshooting......................................................................................... 1

What's new for IBM i 7.3..............................................................................................................................1

PDF file for TCP/IP troubleshooting.............................................................................................................1

Troubleshooting tools and techniques........................................................................................................ 2

Tools to verify your network structure................................................................................................... 2

Netstat...............................................................................................................................................2

Using Netstat from a character-based interface........................................................................ 2

Using Netstat from IBM Navigator for i.......................................................................................5

Ping....................................................................................................................................................7

Using Ping from a character-based interface............................................................................. 8

Using Ping from IBM Navigator for i..........................................................................................10

Common error messages.......................................................................................................... 13

PING parameters.......................................................................................................................14

Trace route...................................................................................................................................... 14

Using trace route from a character-based interface................................................................ 15

Using trace route from IBM Navigator for i...............................................................................15

ARP ping.......................................................................................................................................... 15

ND ping............................................................................................................................................15

Tools for tracing data and jobs.............................................................................................................16

Communications trace....................................................................................................................16

Planning a communications trace.............................................................................................16

Performing a communications trace.........................................................................................17

Additional communications trace functions.............................................................................21

Trace connection.............................................................................................................................22

Trace TCP/IP application................................................................................................................ 22

Job trace......................................................................................................................................... 23

Starting a job trace.................................................................................................................... 24

Re-creating the problem........................................................................................................... 25

Ending a job trace...................................................................................................................... 25

Printing a job trace.................................................................................................................... 25

Deleting a job trace................................................................................................................... 26

Advanced job trace functions................................................................................................... 26

Advanced trace function: Watch support.......................................................................................27

Scenarios: Using watch support with traces............................................................................ 27

Watch parameters..................................................................................................................... 29

Using watch exit programs........................................................................................................29

Traces that use watch support..................................................................................................32

Troubleshooting tips.............................................................................................................................32

Server table.....................................................................................................................................32

Checking jobs, job logs, and message logs.................................................................................... 57

Verifying that necessary jobs exist........................................................................................... 57

Checking the job logs for error messages and other indication of problems.......................... 58

Changing the message logging level on job descriptions and active jobs............................... 58

Other job considerations...........................................................................................................59

Checking for active filter rules........................................................................................................60

Verifying system startup considerations for networking............................................................... 60

Starting subsystems..................................................................................................................61

Starting TCP/IP.......................................................................................................................... 61

Starting interfaces..................................................................................................................... 61

Starting servers......................................................................................................................... 62

Timing considerations............................................................................................................... 63

iii

Varying on lines, controllers, and devices......................................................................................64

Verifying the logical partition configuration................................................................................... 64

Verifying the LPAR configuration from a character-based interface........................................65

Verifying the LPAR configuration from System i Navigator...................................................... 65

Troubleshooting IPv6¨Crelated problems....................................................................................... 65

Advanced troubleshooting tools.......................................................................................................... 66

Licensed Internal Code logs........................................................................................................... 66

Trace Internal (TRCINT) command................................................................................................ 66

Product activity log......................................................................................................................... 67

IOP dump........................................................................................................................................ 67

Process dump................................................................................................................................. 67

Call stack dump......................................................................................................................... 68

Full job dump.............................................................................................................................68

Troubleshooting problems related to specific applications..................................................................... 68

Notices................................................................................................................71

Programming interface information.......................................................................................................... 72

Trademarks................................................................................................................................................ 72

Terms and conditions.................................................................................................................................73

iv

TCP/IP troubleshooting

The TCP/IP troubleshooting topic collection provides tools and techniques to help you solve problems

with TCP/IP connectivity.

This topic is a centralized resource for finding answers to TCP/IP problems. You might have a general

connectivity problem that is quickly identified or a more localized problem that requires in-depth

consideration. Troubleshooting tools are provided in this topic to help you solve the problem.

Note: By using the code examples, you agree to the terms of the ¡°Code license and disclaimer

information¡± on page 69.

What's new for IBM i 7.3

Read about new or significantly changed information for the TCP/IP troubleshooting topic collection.

Determine system reachability by using ARP or ND protocol

? Use the ARP ping (ARPING) function to test reachability of TCP/IP-capable systems that run IP version 4

(IPv4) on the local LAN by using the Address Resolution Protocol (ARP).

? Use the Neighbor Discovery ping (NDPING) function to test reachability of neighboring systems on local

IPv6 interfaces by using the IP version 6 (IPv6) Neighbor Discovery (ND) protocol.

How to see what's new or changed

To help you see where technical changes were made, this information uses:

? The

image to mark where new or changed information begins.

? The

image to mark where new or changed information ends.

In PDF files, you might see revision bars (|) in the left margin of new and changed information.

To find other information about what's new or changed this release, see the Memo to users.

PDF file for TCP/IP troubleshooting

You can view and print a PDF file of this information.

To view or download the PDF version of this document, select TCP/IP troubleshooting.

Saving PDF files

To save a PDF on your workstation for viewing or printing:

1. Right-click the PDF link in your browser.

2. Click the option that saves the PDF locally.

3. Navigate to the directory in which you want to save the PDF.

4. Click Save.

Downloading Adobe Reader

You need Adobe Reader installed on your system to view or print these PDFs. You can download a free

copy from the Adobe Web site

? Copyright IBM Corp. 1997, 2015

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