TCP/IPv6 Migration Guide

Migration Considerations

HP NonStop TCP/IPv6 Migration Guide—524524-004

3-9

Round-Robin Filtering

For NonStop TCP/IPv6, the round-robin filtering feature enables listening applications

running in different processors and sharing the same port (LIF) to share incoming

connections. For information about this feature, see the TCP/IPv6 Configuration and

Management Manual.

Shared Run-Time Library (SRL)

NonStop TCP/IPv6 places most of the protocol stack in a private SRL (on NonStop

S-series servers) or in a DLL (on Integrity NonStop servers, see Dynamic Linked

Library (DLL) on page 3-13) rather than in a process. Users of ZTCP6SRL or

ZTCP6DLL use QIO functions transparently without having explicitly to issue calls to

initialize the QIO segment. This architecture allows TCP/IP to retain its context during

processing and shortens the path length. This library is dynamically loaded into the

application’s process space as soon as the application issues a TCP/IP socket

request.

SRLs are not used on Integrity NonStop servers; DLLs are used instead and there are

no considerations for them. (See see Dynamic Linked Library (DLL) on page 3-13.)

SPI Interface

For configuration compatibility, TCP6SAM supports a subset of SPI objects and

commands. TCP6SAM supports the PROCESS, SUBNET, and ROUTE objects but not

the ENTRY, ADDRMAP, and SERVER objects. TCP6SAM supports only nonsensitive

SPI commands and a few sensitive commands that are supported by NonStop TCP/IP

like ABORT, STOP, PRIMARY, and TRACE on the PROCESS object.

SWAN

To use NonStop TCP/IPv6 for your SWAN applications, enter the name of the

TCP6SAM process for the transport-service provider name. See the TCP/IPv6

Configuration and Management Manual for information about how to create a

TCP6SAM process. See Determining the Name of the Socket Access Method on

page 2-1 for information about how to determine the names of the TCP6SAM

processes that are already created.

SWAN is supported in INET or DUAL mode.

System Configuration Database

NonStop TCP/IPv6 participates in the system configuration database. The

configuration of the subsystem is stored in the configuration database so NonStop

Caution. NonStop TCP/IPv6 uses a private SRL in G-series RVUs. If you run programs that

use private SRLs and you are running NonStop TCP/IPv6, do not create private SRLs that

overlap the following memory segments: 0x75800000 - 0X759FFFFF and 0x7FE00000 -

0x7FE1FFFF. In addition, QIO reserves 0x20000000 - 0x41FFFFFF.