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000188_news@columbia.edu_Tue Jan 17 04:40:54 1995.msg
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From: jong-min@cae.wisc.edu (Jong-Min Park)
Newsgroups: comp.protocols.tcp-ip,comp.protocols.kermit.misc
Subject: Re: xyz-modem through tcp-ip
Date: 17 Jan 1995 04:40:54 GMT
Organization: Division of Information Technology
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Thank you so much for all the feedback. I didn't have time to say thank
you to all who replied.
I have mustered enough hints and info to try out several configs and I
finally got some speed (500 to 1000 cps vs. original 49 or zero cps).
Sorry if this was an FAQ, but just so that someone could benefit from
this info, I'm posting my result.
Here is what I found when using kermit or zmodem transfer through
tcp-ip from my host to a remote site:
In kermit, increasing the receiving packet size can speed up the
transfer. But if the receiving end cannot be tweaked by the user,
you are still out of luck (it still works, in contrast to zmodem).
In zmodem, using a smaller packet size (about 100 bytes for me) and
escaping control characters from the sending host will avoid
'subpacket too long' error and 'CRC' error, respectively. Again,
if you cannot change the configuration from the sending host,
it just doesn't work.
In conclusion, I now do downloads through kermit transfer and uploads
through zmodem transfer, since the remote host doesn't allow changing
of configurations for both sending and receiving.
One strange thing I've noticed when using zmodem was that packet size
less than about 128 went okay, but anything above it somehow hangs at
the last 1024 bytes remaining (actually I can see that all data actually
were sent, but the remaining size to transfer suddenly rises from 0
to 1024, and then nothing happens).
Here is what I wrote:
> I am having trouble sending/receiving files using x/y/z-modem transfer
> on tcp-ip. Here is my setup:
> kermit to connect to a tcp-ip host using telnet
> use sz/rz (v1.26 by Chuck Forsberg) to send/receive files
> The remote host doesn't have ftp, but allows kermit and x/y/z-modem
> transfer. Kermit transfer is too slow (45 cps) on the tcp-ip. And
> since there is no way to fiddle with kermit configuration on the
> remote host, I'm not sure I can speed up kermit transfer.
> When using x/y/z-modem, 'subpacket too long' and 'bad CRC checksum' occurs.
+-------- Jong-Min Park -=?B?EUC-KR?udrBvrnO?=-9ZA>9N-----------
| E-mail: jong-min@engr.wisc.edu
| Office: (608)-263-7784 266 ME Bldg
+-------- University of Wisconsin - Madison