ptx/ITX V4.4.0
Release Notes


Introduction

These release notes support V4.4.0 of the ptx®/ITX software intended for use with NUMA-Q® and Symmetry® systems. Read this document (including the additional information at the end) before you install and run this release of the ptx/ITX software.


ATTENTION

ptx/ITX supports Public Data Networks (PDNs). It does not support the Defense Data Network (DDN) Standard service.



Product Compatibility

The following software products are prerequisites for the ptx/ITX V4.4.0 software product:


Features in This Release

This version of ptx/ITX features several changes in the menu interface and the configuration file format. Refer to the ptx/ITX Administration Guide for more details.


Software Installation

To install ptx/ITX V4.4.0, refer to the DYNIX/ptx V4.4.4 and Layered Products Software Installation Release Notes.

The ptx/ITX Administration Guide describes the configuration procedures for configuring an ITX interface.

If you encounter problems while booting ptx/ITX, you should examine the etc/net_conf/itxd.run file.


Documentation Set

The documentation set consists of the following manual:


Problem Report Summary

This section describes all known problems in this release of the ptx/ITX product.


ptx/ITX Does Not Support DDN Networks (45150)

ptx/ITX does not support DDN networks correctly.

Workaround: None.


TCPDUMP Limitation (208934)

TCPDUMP cannot trace datagrams to and from an ITX interface.

Workaround: None.


The SNMP Agent Will Not Report About a ptx/ITX Interface (208935)

The SMP agent will not report management information about ptx/ITX interfaces.

Workaround: None.


TCP/IP Packet Statistics Across the ITX Interface May Not Be Correct (240528)

TCP/IP statistics will not show the correct IP packet statistics across the ptx/ITX interface.

Workaround: None.


Additional Information


ANONYMOUS Kernel Parameter

The parameter ANONYMOUS is a kernel configuration parameter that specifies whether anonymous connections (those with no calling address) are allowed. If it is set to 1, any call request without a calling address is accepted. The default is 1. Therefore, call requests with no calling addresses are accepted.

Refer to Chapter 3 for the ptx/ITX Administration Guide for information on how to change the value of this parameter.


Configuring ptx/ITX in Loopback Mode

The configuration of ptx/ITX to use two X.25 lines in an external loopback (out one port and back in another on a sync card) is not supported.


IP Addresses for ITX Interfaces

Although TCP/IP supports dynamic address changes for attached interfaces, this feature does not apply to ITX interfaces. If you are changing the IP address of an ITX interface, you have to bring down itxd (ITX daemon) for the change to take effect.

Note also that IP address aliasing is not supported for ITX interfaces.


UDP Datagrams and ITX Interfaces

ptx/ITX maintains two queues for each logical channel. The messages from TCP/IP are stored in these two queues until X.25 is ready to transmit. if the number of packets being queued for transmission reaches the queue limit, ITX starts dropping packets. Therefore, you will see many UDP packets getting dropped if the rate of transmission is high.


Files Shared by ptx/ITX and ptx/TCP/IP

The files /var/tcp/ifnets, /var/tcp/ifaddrs, and /var/tcp/routetab contain configuration information used by ptx/ITX and ptx/TCP/IP. Since these files are supplied by ptx/TCP/IP software, you will need to save the ptx/ITX information in these files before you remove ptx/TCP/IP.