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000057_news@newsmaster….columbia.edu _Thu Sep 24 13:50:34 1998.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Can't get a transfer to work efficiently over a connection with a LanRover in-between.
Date: 24 Sep 1998 17:50:30 GMT
Organization: Columbia University
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References: <6u43q3$fn2$1@ash.prod.itd.earthlink.net> <6u5mis$lnr$1@apakabar.cc.columbia.edu> <6uc3v7$k1j$1@holly.prod.itd.earthlink.net>
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In article <6uc3v7$k1j$1@holly.prod.itd.earthlink.net>,
Mr. Scott <montgomery@starfleet.org> wrote:
: Allow me to rule out a few things.
:
: 1. It is not a transparency problem because the transfer works flawlessly
: when packet-length is < 48 (and window size is 1).
:
Agreed.
: 2. It is not a flow control problem between our modem and UNIX because both
: (as well as kermit itself) are configured properly: both are configured to
: use RTS/CTS (and kermit); also transfers work at very high speeds with other
: remote hosts with no problem.
:
But that does not mean it is not a flow control problem. The fact that
packet lengths > 48 cause a transfer to fail on this connection means that
there a buffer somewhere between your host the destination host that
overflows, and whoever owns that buffer is not flow-controlling its
transmission peer.
: Unfortunately there are no "settings" options at the LanRover prompt that I
: can play with. They must be configured by the administrator using a
: separate program.
:
But if transfers work through the same LanRover to other hosts, then it is
most likely a problem in the particular host where the transfer is failing.
: This is what we are asking the remote client to check:
:
: 1. Check that their modem is also using hardware flow control.
: 2. Check that their LanRover machine serial port is using hardware flow
: control.
: 3. Check to see that the LanRover software is configured to work with
: hardware flow contol.
:
Right. Wherever there is a junction, hardware flow control should be in force
on both ends of it.
: Beyond this, the telnet part of the connection is through TCP/IP and needs
: no flow control configuration, right?
:
You would think so, but some Telnet servers allow data to be lost when the
controlling (pseudo)terminal is not using flow control.
In any case, we should probably move this discussion to email. If your
investigations do not prove fruitful, we'll need more details about the two
hosts, Kermit versions, settings, etc, and probably also some packet and/or
debug logs. The Kermit support email address is:
kermit-support@columbia.edu
- Frank