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000126_news@newsmaster….columbia.edu _Fri Oct 17 10:16:10 1997.msg
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From: fdc@watsun.cc.columbia.edu (Frank da Cruz)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: msdos kermit and external protocols
Date: 17 Oct 1997 14:16:06 GMT
Organization: Columbia University
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In article <627dad$snq@winter.news.erols.com>, kifox <kifox@hotmail.com> wrote:
: Was wondering if it would be possible for the msdos version of kermit to
: include support for external protocols like zmodem,ymodem,hydra ect in the
: same fashion that most dos-based com programs do. Some sites you can telnet
: to don't support the kermit protocol for file transfers.
:
Not for Telnet connections, since the TCP/IP stack is implemented in MS-DOS
Kermit itself. If it started another program to execute the external
protocol, the TCP/IP stack would no longer be active.
We can do this in UNIX because the operating system permits. DOS is not
an operating system in the conventional sense -- it does not support multiple
processes, networking at the kernel i/o level, etc.
Even if it worked, it might not work since Zmodem implementations quite often
fail to upload or download or both over Telnet connections because of
transparency issues.
There is no reason at all why Kermit protocol can't be available on every
host, service, BBS, or other thing that you can Telnet to. When it's not,
simply point the provider to the Kermit website:
http://www.columbia.edu/kermit/
Of course you can use DSZ or whatever as an external protocol on a serial
connection; people have been doing it for years.
- Frank