sting@laotse.cam.nist.gov (s. ting) (02/28/90)
We have a ProNET-80 fiber ring on campus. Many P4200s are attached to the ring through p3280s. Ethernets are connected to those P4200s. One scientist here tried to ftp his three image files (3-dimensional) from his HP running unix on one Ethernet to another host on a different Ethernet through the ring. The ftp always stuck. But, with same hosts involved, no problems with ftping at all for other files no matter the file sizes and binary or ascii. I observed on p4200 many "Op err 8704 hst xxx" messages like below being pumped out as soon as the ftping of any one rgb file began. Those messages did not appear while we tried other different files. Op err 8704 hst 376 nt 0 int Pro/0 Op err 8704 hst 376 nt 0 int Pro/0 Op err 8704 hst 376 nt 0 int Pro/0 Op err 8704 hst 376 nt 0 int Pro/0 Op err 8704 hst 376 nt 0 int Pro/0 Op err 8704 hst 376 nt 0 int Pro/0 Op err 8704 hst 376 nt 0 int Pro/0 So, it appears that ProNET-80 has something to do with it. Does anyone have similar experience or know what is going on? Michael Ting, NIST, (301) 975-3802
tvm@proteon.com (Tom Miceli) (02/28/90)
Mike, How many P4200's do you have on the P-80 ring? One of the modems is probably out of alignment. What you need to do is CLEAR network stats on all routers, transfer the file, then look at the interface stats for the P-80's on the router. Look for the router with the largest number of INPUT PARITY ERRORS. Either the Fiber modem or the P-80 interface in that router may be out of alignment. Let us know what happens. Tom Miceli, Mgr Tech Support
CLIFF@UCBCMSA.BITNET (Cliff Frost {415} 642-5360) (02/28/90)
Michael,
I suspect that your p80 ring has the classic data-dependent problem.
You can test it by sending files or pings through the ring that have
the data pattern hex 33, or hex EE, or any of a few others.
With anonymous ftp to jade.berkeley.edu you can get two programs that
may help you detect where the failing component is. The ping.c and
netout.c programs in the pub directory there both take an argument
to specify a data pattern to fill your packets with.
Ping tests the entire ring, while netout sends data to the TCP
discard port on the remote host and so you can use it to exercise
discreet individual segments.
Proteon Customer Service should be able to help you with this, but
if you like you can call me and I'll be happy to discuss it as well.
Cliff Frost (415) 642-5360
Central Computing Services <cliff@berkeley.edu>
University of California CLIFF AT UCBCMSA
Berkeley, CA 94720