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000104_news@columbia.edu_Wed Jan 4 05:00:17 1995.msg
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From: jrd@cc.usu.edu (Joe Doupnik)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: PPP support?
Message-Id: <1995Jan4.110017.36484@cc.usu.edu>
Date: 4 Jan 95 11:00:17 MDT
References: <3eef7f$39a@usenet.rpi.edu>
Distribution: world
Organization: Utah State University
Lines: 45
Apparently-To: kermit.misc@watsun.cc.columbia.edu
In article <3eef7f$39a@usenet.rpi.edu>, luy@cayley.math.rpi.edu (Ya Yan Lu ~{B=QEQT~}) writes:
> I have been using mskermit (version 3.13 and 3.14) to connect to the
> UNIX account through a modem from my PC at home. The Xyplex terminal
> server for the UNIX account supports SLIP, CSLIP, PPP. Using the
> packet drivers slipper.exe, cslipper.exe, I have succesfully made the
> connection though the internel TCP/IP support of mskermit. It works
> great.
>
> However, it seems that mskermit does not work with PPP. I am using the
> Merit packet driver ppp.exe (from EtherPPP.zip). The parameters that I
> set for the TCP connection must be right, since the same parameters
> (IP addresses, gateway, nameservers, etc) work well with NCSA telnet,
> CUTCP, WATTCP. Going through the documents of kermit, I only find that
> mskermit supports Telbits(spelling?) PPP. Am I still doing something
> wrong?
>
> BTW, using my 1.44k (V.32bis) modem (with V.42 error correction,
> V.42bis data compression enabled), I can still only get ~1.2kbytes/s
> for down loading (in CSLIP) for pre-compressed files (zip files). I
> have tried everything: (a) set the modem right (b) set receive
> packet-length, window, (c) control unprefixed (except for 0, 1, 155).
> On the same line, with ftp from NCSA or CUTCP, 1.7kb/s can be achived.
--------------
As we've mentioned a number of times here and in the docs, MS-DOS
Kermit's internal TCP/IP stack works with
a) Packet Drivers which present either an Ethernet (DIX flavor) or
SLIP interface,
b) Novell ODI drivers, including SLIP_PPP,
c) Telebit's PPP drivers (Packet Driver flavor and ODI flavor).
There is no such thing as a standardized top level interface for
PPP drivers. Every one is vastly different, and almost completely undoc'd.
I wish I could say something nice about Merit's Etherppp package,
but to be honest it has never ever run here. It hangs my PC every time as
it initializes, well before Kermit enters the picture, and I do know what
I'm about in PCs.
I think you will find the next beta has better SLIP performance,
but it's rather awkward for me to explore this locally. A lot, and that
does mean a lot, of work has been done to minimize the number of packets
appearing on the wires so that SLIP and PPP may work well. There is a
tradeoff between fewest packets and greatest throughput in the face of
packet losses, yet SLIP/PPP wants both. There are no canned cures for these
conflicting requirements. And that means I won't entertain any silly bits/sec
contest such as we see with straight serial comms; it's just not that simple.
Joe D.