HP OpenVMS Systems Documentation
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Compaq TCP/IP Services for OpenVMS
Tuning and Troubleshooting

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Contents (summary)
Preface Preface
Chapter 1 Troubleshooting Techniques and Tools
Chapter 2 Tuning Techniques
Appendix A Troubleshooting Tools Reference
Appendix B Commonly Used UNIX Commands
  Index
  Tables

Contents

Preface
Preface Preface
Chapter 1
1 Troubleshooting Techniques and Tools
     1.1     Using Symptoms to Identify a Problem
     1.2     Isolating Problems
         1.2.1         Testing Connectivity Between Network Hosts
             1.2.1.1             Using ping on a Multihomed Host
         1.2.2         Checking the Network Interface Parameters
         1.2.3         Displaying and Modifying the Internet-to-Ethernet Translation Tables
         1.2.4         Examining Network Statistics
         1.2.5         Monitoring Network Traffic
         1.2.6         Checking Name Server Operation
         1.2.7         Checking the Route to a Remote Host
         1.2.8         Checking the Routes Known to a Gateway
         1.2.9         Determine Whether Network Services Are Available
             1.2.9.1             Displaying the Service Database
             1.2.9.2             Displaying Service Attributes
             1.2.9.3             Verifying Process Privileges
             1.2.9.4             Verifying Account Privileges
             1.2.9.5             Looking for OPCOM Messages
Chapter 2
2 Tuning Techniques
     2.1     Kernel Subsystems
         2.1.1         Displaying Subsystems and Attributes
         2.1.2         Testing Attribute Support
         2.1.3         Displaying Attribute Values
         2.1.4         Modifying Attribute Values
         2.1.5         Modifying Attributes Temporarily
     2.2     Modifying Kernel Subsystems
         2.2.1         Modifying Socket Subsystem Attributes
             2.2.1.1             Increasing the Maximum Number of Pending TCP Connections
             2.2.1.2             Increasing the Minimum Number of Pending TCP Connections
             2.2.1.3             Increasing the Maximum Size of a Socket Buffer
         2.2.2         Modifying Internet Subsystem Attributes
             2.2.2.1             Increasing the Size of a TCP Hash Table
             2.2.2.2             Increasing the Number of TCP Hash Tables
             2.2.2.3             Increasing the Size of the Kernel Interface Alias Table
             2.2.2.4             Increasing the TCP Partial Connection Timeout Rate
             2.2.2.5             Slowing TCP Retransmission Rate
             2.2.2.6             Enabling the TCP Keepalive Function
             2.2.2.7             Increasing the Timeout Rate for TCP Connection Context
             2.2.2.8             Modifying the Range of Outgoing Connection Ports
             2.2.2.9             Disabling Use of the PMTU Protocol
     2.3     Monitoring Servers
         2.3.1         Displaying Network Statistics
         2.3.2         Displaying Socket Statistics
     2.4     Tuning Server Applications
         2.4.1         Configuring Memory for High Performance
         2.4.2         Logging IP Addresses
     2.5     Increasing the Auxiliary Server Connection Limit
     2.6     Solving Performance Problems
         2.6.1         Tuning Recommendations for a Primary Server
Appendix A
Appendix A Troubleshooting Tools Reference
    Command 1     arp
    Command 2     dig
    Command 3     ifconfig
    Command 4     ndc
    Command 5     netstat
    Command 6     nslookup
    Command 7     ping
    Command 8     route
    Command 9     sysconfig
    Command 10     TCPTRACE
    Command 11     traceroute
Appendix B
Appendix B Commonly Used UNIX Commands
Index
Index
Tables
1 TCP/IP Services Documentation
1-1 Diagnostic Tools
2-1 Network Tuning Guidelines
2-2 socket Subsystem Attributes
2-3 inet Subsystem Attributes
2-4 TCP Keepalive Options
A-1 dig Options
A-2 Options to the nslookup set Command
B-1 Commonly Used Commands
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