HP OpenVMS Systems Documentation

Content starts here HP TCP/IP Services for OpenVMS

HP 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 Utilities Reference


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
                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
                Using TCPTRACE
                Using TCPDUMP
                        Building Expressions
                        Keywords for Filtering Traces from non-OpenVMS Systems
                        Primitive Keywords
                        Primitive Expressions
                        Accessing Data Inside Packets
                        Combining Keywords
                Analyzing Output
                        Link Level Headers
                        ARP Packets
                        TCP Packets
                        UDP Packets
                        UDP Name Server Requests
                        UDP Name Server Responses
                        Sun RPC Requests and Replies
                        IP Fragmentation
                Reducing Discarded Packets
         1.2.6         Monitoring Socket Activity
         1.2.7         Checking Name Server Operation
         1.2.8         Checking the Route to a Remote Host
         1.2.9         Checking the Routes Known to a Gateway
         1.2.10         Determine Whether Network Services Are Available
                Displaying the Service Database
                Displaying Service Attributes
                Verifying Process Privileges
                Verifying Account Privileges
                Looking for OPCOM Messages
     1.3     Using Online Help
     1.4     Using OpenVMS ANALYZE Extensions
Chapter 2
2 Tuning Techniques
     2.1     Subsystem Attributes
         2.1.1         Displaying Subsystems and Attributes
                Static and Dynamic Subsystems
                Displaying the Attribute Values for a Subsystem
         2.1.2         Modifying Subsystem Attribute Values
                Reconfiguring Attributes
         2.1.3         Configuring Attributes
                Format of the SYSCONFIGTAB File
                Stanza File Format
         2.1.4         Modifying Kernel Subsystems
         2.1.5         Modifying Socket Subsystem Attributes
                Increasing the Maximum Number of Pending TCP Connections
                Increasing the Minimum Number of Pending TCP Connections
                Increasing the Maximum Size of a Socket Buffer
         2.1.6         Modifying Internet Subsystem Attributes
                Increasing the Size of a TCP Hash Table
                Increasing the Number of TCP Hash Tables
                Increasing the Size of the Kernel Interface Alias Table
                Increasing the TCP Partial Connection Timeout Rate
                Slowing TCP Retransmission Rate
                Enabling the TCP Keepalive Function
                Increasing the Timeout Rate for TCP Connection Context
                Disabling Delayed Acknowledgment
                Modifying the Range of Outgoing Connection Ports
                Disabling Use of the PMTU Protocol
         2.1.7         Displaying Socket Statistics
     2.2     Tuning Server Applications
         2.2.1         Configuring Memory for High Performance
         2.2.2         Logging IP Addresses
         2.2.3         Increasing the Auxiliary Server Connection Limit
         2.2.4         Increasing the Maximum Number of BG Devices
     2.3     Solving Performance Problems
         2.3.1         Tuning Recommendations for a Primary Server
         2.3.2         Improving Gigabit Ethernet Performance

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