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From: MAP@lcs.mit.edu (Michael A. Patton)
Newsgroups: comp.dcom.sys.cisco
Subject: Terminal server hangs
Message-ID: <35089@boulder.Colorado.EDU>
Date: 15 May 91 01:35:27 GMT
Sender: daemon@boulder.Colorado.EDU
Lines: 29


   From: jmr1@Ra.MsState.Edu (Mike Rackley)
   Date: Tue, 14 May 91 15:28:44 CDT

   For months we have been chasing the following problem.  The problem
   is that output coming back to dial up terminals through the
   terminal server will hang for anywhere from 30 seconds to 2 minutes
   at a time.

We have seen exactly this same problem and are also trying to track it
down.  We are presently running 8.1(25) on that system, but saw it 5
months ago with 7.1(7).  I'm not sure but it seems to be correlated
with heavy load on the terminal side, not the Ethernet side.  It has
become a problem now during two consecutive final exam periods.  We
thought we'd finally tracked it down last time, but I guess it was
just end-of-finals.  It came back this month to haunt us again.

We have 24 active dialups running at a fixed 19.2KB rate between the
TS and the modem using hardware flow-control to compensate for speed
mismatch in the calling modem.  Some of the lines are being used for
upload/download, but most are regular terminal sessions.

            __
  /|  /|  /|  \         Michael A. Patton, Network Manager
 / | / | /_|__/         Laboratory for Computer Science
/  |/  |/  |atton       Massachusetts Institute of Technology

Disclaimer: The opinions expressed above are a figment of the phosphor
on your screen and do not represent the views of MIT, LCS, or MAP. :-)