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- WINPKT - Interface between Microsoft Windows and a Packet Driver
-
- Prof. Joe R. Doupnik, Utah State University, Logan Utah
-
- May, 1992
-
- WINPKT is a helper program for Packet Drivers, called a "shim", because it is
- inserted between two other programs that normally talk directly to each other.
- It does an essential job for applications that use packet drivers and that run
- under Windows: it knows how to contact the application properly when a packet
- arrives for it. The reason this is a tricky business is that Windows moves
- applications around in memory, but the packet driver thinks its applications
- are at fixed addresses. If a packet driver attempts delivery the process will
- likely cause major systems problems (or worse) when the packet data is written
- to the wrong address. To use WINPKT:
-
- 1. Start your packet driver, but give it an interrupt number higher than
- the normal 0x60.
-
- 2. Start WINPKT with a command line of:
-
- winpkt win_int pd_int
-
- The first item, win_int, is the interrupt seen by applications as if WINPKT
- were a Packet Driver. Let win_int be 0x60. The second item, pd_int, is the
- interrupt of the real Packet Driver, say 0x63. The two must be different
- values and please make win_int be SMALLER than pd_int.
-
- 3. Then start Windows.
-
- Tell applications to use the win_int value for a Packet Driver interrupt.
- Many applications will search for it instead, thus by making win_int smaller
- than pd_int they will find WINPKT instead of the Packet Driver (and that's
- what we want to happen).
-
- WINPKT does NOT permit one to run multiple TCP/IP applications together in
- Windows. There are fundamental reasons why this should not be done. It is
- fine to leave WINPKT installed when Windows is not active, because it becomes
- transparent then. Please do NOT use the "-w" switch of Crynwr Collection
- Packet Drivers with WINPKT; that switch causes packets to be discarded. Also
- it is not necessary to "fix application in memory" via the Windows PIF file
- when WINPKT is installed because WINPKT is smart enough to let that
- restriction be removed.
-
- Here is a sample network startup Batch file with all the components in place:
-
- @echo off
- c:\wd8003e 0x63 7 0x280 0xca00 (Regular Packet Driver)
- c:\winpkt 0x60 0x63 (WINPKT)
- c:\ipx (Packet Driver version of Novell's IPX)
- c:\netx PS=edu-usu-netlab2 (Novell, connnect to my server)
- @echo on
-
- (End of WINPKT.DOC)
-