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G&R

Transport stacks

The DSA/DIWS handler interfaces to a transport stack. The transport stack

traditionally used by Bull front-ends and mainframes was the OSI-transport

stack, and the Host Links products needed a corresponding OSI-transport stack

in order to connect. This is no longer the case. Bull supports the Internet

standard RFC1006 protocol layer, allowing native DSA sessions to be

established over TCP/IP networks.

The DSA line module includes both the OSI interface and the TCP/IP based

RFC1006 interface. On some UNIX systems OSI interface files are requested at

load time and if no OSI stack is installed, the loading of the line module may

fail. For this reason we deliver a DSA line module that includes only the

RFC1006 interface and this module is optionally installed during the Host

Links installation process:

Your choices are:

1. DSA over OSI and RFC1006 (requires OSI stack)

2. DSA over RFC1006 only

Your choice is [2]?

Please choose 2 if you will be using only RFC1006.

RFC1006

For customers with a MainWay front-end and Open Network Processor, a

GCOS8 GNSP processor or a GCOS7 Diane system, RFC1006 support is

standard. RFC1006 support can also be installed in the FCP7 or FCP8 FDDI

adapters. For customers with RFC1006, the G&R products can make genuine,

fully functional DSA connections over a TCP/IP network. This removes the

requirement of purchasing and installing OSI transport software on the Host

Links platform. We supply the RFC1006 protocol stack as a part of the standard

delivery of Host Links. If RFC1006 is available on the mainframe system or

MainWay front-end, then no communications software other than the standard

TCP/IP stack is needed on the Host Links platform. See the -who gar

parameter to the tp (transport provider) directive in the dsa.cfg file

described on page 80.

If you intend to accept incoming connections over RFC1006, you must start the

nl_dsa listener, and it must be started from root because only root can

reserve the RFC1006 reserved port 102.

Gline Line Handlers and Configuration

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