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000185_news@columbia.edu_Mon Jan 16 20:11:09 1995.msg
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1995-07-31
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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
Followup-To: comp.protocols.tcp-ip
Date: 16 Jan 1995 20:11:09 GMT
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Sorry that I may have been a little unclear. Here is more info:
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.
I've succeeded in transferring ascii files between local machines just
to test it: 'sz -a -L 80 filename' and 'rz -a'. If I omit -L, 'subpacket
too long' error occurs. Although 'bad CRC' still occurs, it is only
intermittent. Now binary transfer completely fails (bad CRC), but again
'subpacket long' disappears with -L option.
I think there are two problems: 8-bit control code is being translated
where it shouldn't be. And assembling of subpackets may be causing
problems with tcp-ip packet size limit.
I'm not too familiar with subpacket assembling or zmodem packets, nor
telnet negotiation.
Has anyone succeeded in x/y/z-modem transfer using tcp-ip? Otherwise,
what would be the cause for the error? Any solution or hints would be
greatly appreciated.
Please reply to jong-min@engr.wisc.edu if possible. Thank you.
+-------- 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