drk@athena.mit.edu (David R Kohr) (02/16/90)
I am attempting to install the NCSA Telnet network software package on
a CompuAdd 286/12 AT clone. The PC has a 3Com 3C505 Ethernet board
installed, with IRQ interrupt number 12, DMA channel 5, and I/O
address 0x300. I'm using the 3C505.COM "packet driver" TSR driver
program supplied with the NCSA package to interface with the board.
The driver installs perfectly fine, and I can run Telnet and connect
to a host just fine at first. Then, after I've been logged in for
just a few minutes, the Telnet program seems to "freeze up" and
not display any output from the host (which is a Sun 3/260 running
Sun/OS 4.0.3). I can still hit Alt-X to exit from Telnet.
Similarly, the NCSA FTP program seems to work OK at first, but
during long file transfers (over 1 Mb.) eventually "freezes up" and ceases
to receive packets from the host. The FTP program locks up in such
a way that I have to reboot the PC.
I know that the Ethernet connection to the Sun is fine, since I've
been able to install and run Sun's PC-NFS software on the same PC
with no problems at all. The problem seems to be something
between the packet driver and the Ethernet board. I tried adjusting
the "mtu", "rwin", and associated IP packet parameters in "config.tel",
but these didn't seem to make a difference. If someone has any advice
about how to solve this problem, I'd greatly appreciate it if they
would reply to me by e-mail or post to the Net.
Thanks,
David R. Kohr M.I.T. Lincoln Laboratory Group 45 ("Radars 'R' Us")
email: KOHR@LL.LL.MIT.EDU or DRK@ATHENA.MIT.EDU
phone: (617)981-0775 (work), (617)527-3908 (home)