r_hockey@fennel.cc.uwa.oz.au (06/12/91)
Can anyone explain this, I have beeb experimenting with NCSA telnet 2.3 on various machines on our PC-NFS network. I find that where the PC has a 3com 3C501 card PC-NFS remains unaffected by using NCSA telnet, but PC's with a Western Digital WD8003E ethernet card PC-NFS crashes. Is it the memory on the WD card that causes the problem? If so can it be disabled? Richard Hockey Public Health UDM University of Western Australia NEDLANDS WA 6009
geoff@bodleian.East.Sun.COM (Geoff Arnold @ Sun BOS - R.H. coast near the top) (06/13/91)
Quoth r_hockey@fennel.cc.uwa.oz.au (in <1991Jun12.102647.3385@fennel.cc.uwa.oz.au>): #Can anyone explain this, #I have beeb experimenting with NCSA telnet 2.3 on various machines on #our PC-NFS network. I find that where the PC has a 3com 3C501 card #PC-NFS remains unaffected by using NCSA telnet, but PC's with a Western #Digital WD8003E ethernet card PC-NFS crashes. Is it the memory on the #WD card that causes the problem? If so can it be disabled? In general, as has been restated many times on comp.protocols.nfs and comp.protocols.tcp-ip.ibmpc, it is not possible to run two TCP/IP stacks at the same time in the same system. However. In the case you describe, NCSA is trying to take over the network interface, use it for a while, and then quit, allowing PC-NFS to continue working. (Obviously you don't want to try accessing an NFS drive while running NCSA!) Whether or not this works depends on the statefulness of the board and the PC-NFS driver. In the case of the 3C501, all NCSA has to do is restore the interrupt vector: there's little or no state on the board. (There's actually not much of anything on the board, but still....) However such a simple approach isn't sufficient for the WD8003E. I suppose that if the WD803E driver had been written more robustly, and had included recovery logic for such an occurrence, then it could have been made to work. It wasn't. It doesn't.) --Geoff Arnold, PC-NFS architect(geoff@East.Sun.COM or geoff.arnold@Sun.COM)-- ------------------------------------------------------------------------------ -- Sun Technology Enterprises : PC Networking group -- -- (officially from July 1, but effectively in place right now) --