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000018_hvanclee@nyx.net_Thu Oct 17 09:58:48 EDT 2002.msg
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Article: 13781 of comp.protocols.kermit.misc
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Problems transferring over ppp connection
References: <1034801647.495773@irys.nyx.net> <aokm12$7lv$1@watsol.cc.columbia.edu>
Organization: Nyx, Spirit of the Night
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From: hvanclee@nyx.net (Henry van Cleef)
Originator: hvanclee@nyx.net (Henry van Cleef)
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Date: 16 Oct 2002 18:50:02 -0600
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In article <aokm12$7lv$1@watsol.cc.columbia.edu>,
Frank da Cruz <fdc@columbia.edu> wrote:
>In article <1034801647.495773@irys.nyx.net>,
>Henry van Cleef <hvanclee@nyx.net> wrote:
>:
>: The TCP/IP connection uses STREAMING, and I suspect that my problem
>: lies in the fact that it's much faster than my modem setup can handle.
>: What's the proper way to deal with this.
>:
>The culprit is most likely a lack of effective flow control.
>
Thanks for the quick response, giving me an idea where to look.
>: crtscts
>:
>Presumably "crtscts" sets hardware flow in the PPP driver. But how do we
>know it is also being set in the modem? When Kermit does the dialing, it
>proactively sets the modem for hardware flow control (unless you told it
>not to). When PPP does the dialing, who knows. Maybe the modem's powerup
>or reset state does not include RTS/CTS. Can you watch the "chat script"
>between the PPP driver and your modem? Compare it with Kermit dialing
>with "set dial display on".
>
Interesting. I stole the Kermit initialization string for the ppp
dialer, but will have to double-check that I got the whole thing.
I have the specific manual for the modem that gives all the control
register information, so will double check against that as well.
Also have a light box on the modem serial line, so can see if the
signals are being toggled properly.
>Do you call the same number for shell login and PPP login? If not, maybe
>there is also a problem on remote end between the answering modem and the
>terminal server. If it IS the same number, the problem is almost certainly
>between the PPP driver, the serial-port driver, and the calling modem.
>
Yes, it is the same Portmaster and modem bank. I'm not sure that I
trust the ppp setup at that end, but I have the docs for that end and
can look at the configuration files on the Radius server (I'm an admin
on the target system, so essentially "own both ends."
Hank