ID Number: Q66937
2.00
OS/2
Problem:
I am having the following problems that involve DLC support:
1. I'm trying to run a program that uses the DLC interface
(Attachmate, IBM terminal program, etc.) on my OS/2 LAN Manager
version 2.00 DOS workstation. However, the program will not
communicate with the host: I get errors that include indication of
insufficient SAPs.
2. We recently upgraded from 3Com's 3+Open 1.x to Microsoft OS/2 LAN
Manager version 2.00 (or 3Com LAN Manager 2.0). Our DLC requisite
programs that ran fine on 3+Open 1.x will not run on OS/2 LAN
Manager version 2.00.
Response:
The information included below describes why the problems listed above
are occurring.
The transport stack that was provided in OS/2 LAN Manager version 1.00
consisted of two components. The first component was a "NetBEUI"
transport module that would bind to the second component, an 802.2
"DLC" logical link control module. The DLC module would bind to the
MAC driver.
This stack was made by Madge Corp. and has been referred to as the
"Madge Stack." 3Com's 3+Open 1.x product, an implementation of OS/2
LAN Manager versions 1.x, included the Madge Stack, and several
customers took advantage of the DLC interface to run DLC requisite
applications.
OS/2 LAN Manager version 2.00 does not include the Madge Stack. The
transport stack included with OS/2 LAN Manager version 2.00 is
NetBEUI, a single component module that binds directly to the MAC
driver. NetBEUI does not provide full DLC, and does not have the DLC
interface. Therefore, DLC requisite applications that ran OS/2 LAN
Manager versions 1.x with the Madge Stack will not run on OS/2 LAN
Manager version 2.00 with the NetBEUI transport stack.
Microsoft plans to include a full, IBM compatible DLC interface in OS/2
LAN Manager version 2.10.
A customer may opt to continue using OS/2 LAN Manager versions 1.x on
workstations that require the DLC interface while upgrading servers
and other workstations to OS/2 LAN Manager version 2.00.
This could provide an interim solution until OS/2 LAN Manager version
2.10 becomes available.