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HP 3000 MPE/iX Computer Systems > Chapter 3 System Management

3.5: Increase in Number of TCP Connections

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Transaction Manager

Overview of CI Enhancements

by Ganesh HS and Chandrashekar MN
Commercial Systems Division

Introduction

Prior to the MPE/iX 6.0 release, TCP on MPE/iX allowed a maximum of 4096 connections. An enhancement to the TCP module allows up to 5600 connections. The version ID of TCP (NET_TCP_VERS in nmmaint,3) which supports this feature will start with B060.

Configuration through NMMGR

You need to configure the machine to allow it to go up to 5600 connections. The NMMGR screen for configuring the maximum connections looks like the following: 

 NMMGR/3000 (B.06.00) Transmission Control Protocol (TCP) Config  Data: Y
 When Data Flag is "N", press "Save Data" to create the data record.
 Command:

 Path:  NETXPORT.GPROT.TCP

 [N]       Checksum Enabled (Y For Yes, N For No)

 [256 ]    Maximum Number of Connections

 [2  ]     Retransmission Interval Lower Bound (Secs)
 [180  ]   Maximum Time to Wait For Remote Response (Sec)
 [10 ]     Initial Retransmission Interval (Secs)
 [4  ]     Maximum Retransmissions per Packet

 [600  ]   Connection Assurance Interval (Secs)
 [3  ]     Maximum Connection Assurance Retransmissions

 File:  NMCONFIG.PUB.SYS

                                                Save     Help    Prior
                                                         Data    Screen
The field, "Maximum number of connections" can now handle up to 5600 connections. Before this enhancement the range was 0 to 4096. To reach this screen, "Transmission Control Protocol (TCP) Config" in NMMGR, do the following:
  1. Go to [ Open Config ]

  2. Go to [ NS ]

  3. Go to [ Unguided ]

  4. Go to [ Netxport ]

  5. Go to [ Gprot ]

  6. Go to [ Tcp ]
After the re-configuration is validated, stop, then restart, the network to implement the increased TCP connection limit. It is not necessary to reboot the machine.Now TCP is ready to accept up to 5600 TCP connections.


Transaction Manager

Overview of CI Enhancements