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000301_news@newsmaster….columbia.edu _Sat Nov 14 18:06:55 1998.msg
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From: jrd@cc.usu.edu (Joe Doupnik)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: check tcp/ip
Message-ID: <CCP0WFR78iFj@cc.usu.edu>
Date: 14 Nov 98 15:31:15 MDT
References: <7276a4$l10$1@garfield.vcn.bc.ca> <72kehr$1gd$1@garfield.vcn.bc.ca>
Organization: Utah State University
Lines: 48
Xref: news.columbia.edu comp.protocols.kermit.misc:9508
In article <72kehr$1gd$1@garfield.vcn.bc.ca>, dastow@vcn.bc.ca (David Stow) writes:
> Thanks for the answers. I'm going to pester you with a related
> question, but first let me explain what I want to do.
>
> I use MS-Kermit 3.15 both for making (relatively) simple serial
> connections and for making TCP/IP connections over a PPP link.
> I use the same serial port and modem in each case, and until recently
> I used the standard mscustom.ini file without trouble. The :NOTCP port
> settings in this file matched those in the PPP initialization file.
>
> I recently replaced my 16450 type UART with a 16550A, and when I
> started MS-Kermit over the PPP link, I got a message that Kermit
> couldn't make the connection to my host. I took a closer look at
> the mscustom.ini file, and I suspected that I should make Kermit
> skip over the commands (like set speed) that could reset the UART
> while the PPP link was running. When I deleted the :NOTCP part of
> the file and the "if fail forward :NOTCP" command, the TCP/IP
> connection worked again.
>
> My guess is that resetting the UART (to the same values that the
> PPP program was using) caused a problem with the 16550A but not with
> the 16450 because of the characters that might be lost from the
> 16550A's buffer during the reset. Does this sound right?
>
> I want to have Kermit check when it starts to see whether the packet
> driver is running, to set the port to tcp/ip and skip the UART
> initialization if it finds the packet driver, and to set the UART
> otherwise.
>
> Can I use the tcpip_status variable to do this? I'm not sure I
> understand the value of this variable. When I escape from a TCP/IP
> session to the MS-Kermit prompt and give the show variables
> command, \v(tcpip_status)=0. Is this like opening the refrigerator
> door quickly to try to see if the light stays on when the door is closed?
>
> David Stow
----------
The way to have MS-DOS Kermit keep hands off a UART is to avoid
all references to the serial port. That means a SET PORT non-UART command
issued before a SET SPEED will point operations away from a serial port.
The 16550A UART requires delicate probing, something that the
conventional 8250 and relatives kind does not. It is always bad news to
touch a device being handled by other software.
The check item means only that a feature is complied into the
program. This is to deal with variants of MSK which have selective
features omitted to save memory. It has nothing at all to do with
operational selections of this port or that.
Joe D.