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000298_news@columbia.edu_Tue Sep 5 10:57:35 1995.msg
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From: jrd@cc.usu.edu (Joe Doupnik)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: MS-KERMIT 3.14 hanging on idle TCP/IP connection?
Message-Id: <1995Sep5.165735.60618@cc.usu.edu>
Date: 5 Sep 95 16:57:35 MDT
References: <42d2u9$edt@apakabar.cc.columbia.edu> <2979@sun3.IPSWITCH.COM> <42ie3r$cfo@Mars.mcs.com>
Organization: Utah State University
Lines: 37
Apparently-To: kermit.misc@watsun.cc.columbia.edu
In article <42ie3r$cfo@Mars.mcs.com>, les@MCS.COM (Leslie Mikesell) writes:
> In article <2980@sun3.ipswitch.com>, Dan Lanciani <ddl@harvard.edu> wrote:
>
>>Wouldn't it be funny if that special case was somehow accidentally filtering
>>out the ARP request from Linux? I wonder if there is anything unusual (but
>>legal) about Linux ARP requests? A network trace of this problem would
>>make diagnosis _so_ much easier...
>
> I noticed some time ago that 3.14 would time out and lose it's connection
> to AT&T Svr4 machines but not to Dell Svr4. But, I mostly have
> winsock stacks these days so I went back to 3.12 on the dos machines
> and it doesn't have the problem.
>
> Les Mikesell
> les@mcs.com
--------
As always, I remain attentive to these problems, even if I can't
nail down the effect at my place. MSK sits for hours to my SVR4 machine
and finally the latter decides that I've gone home and logs me out. It's
a UnixWare 2.02 box.
The comment that Linux loses its ARP cache entry and can't communicate
until it's filled in by subtrafuge leads one to believe there is a Linux
problem.
For tracking ARP requests arriving at an MSK machine I have available
privately a special version which displays each such incoming request. Please
contact me directly (jrd@cc.usu.edu) for the test tool; it is NOT for general
distribution, please, so don't ask without a really good story plus a note
from your Mom.
To record who said what to whom on a very short time scale basis
we have the Crynwr Collection Trace and Dump programs. Trace has only a
55KB (approx) buffer in which to write packets and that does not last long
on a network. Netwatch can show things visually, if desired. Both are free.
See netlab1.usu.edu pub/mirror/pktdrvr and pub/netwatch, resp.
Finally, on Dan's thread, MSK can be made Internet active without
a remote host (and hence respond to Pings etc) by putting it into TN server
mode: SET PORT TCP * and then CONNECT. The star means be a Telnet server.
Joe D.