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000097_news@newsmaster….columbia.edu _Tue Oct 14 18:10:11 1997.msg
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From: dlane@contactpt.com (David Lane)
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Kermit via PPP under DOS?
Date: 14 Oct 1997 17:58:51 -0400
Organization: Contact Point Technologies
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Message-ID: <uoh4sknvo.fsf@dlane.contactpt.com>
References: <k1c7kBQEU5Wv@cc.usu.edu> <omvhza9x7g.fsf@tees.cs.ualberta.ca>
<5jzp7SiZjuUm@cc.usu.edu> <omn2kcqegc.fsf@tees.cs.ualberta.ca>
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In-reply-to: Vladimir Alexiev's message of 14 Oct 1997 14:25:55 -0600
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Xref: news.columbia.edu comp.protocols.kermit.misc:7875
In article <omn2kcqegc.fsf@tees.cs.ualberta.ca>
Vladimir Alexiev <vladimir@cs.ualberta.ca> writes:
[snip]
> > Proxy ARP et al have not the slightest to do with Kermit (or other
> > client) internals. That is outside of and unknowable to these clients.
> I know that. I was trying to figure out how does class 1 emulation work.
>
> For a PPP link, Kermit`s job is pretty simple: it has to send all it wants to
> send down the link, without caring mcuh about MAC addresses. That's why I
> think it would be an easy fix: Kermit could simply disregard some of its
> "doubts" about the faithfulness of the class 1 emulation and just go ahead.
[snip]
Now this may be a boneheaded question, but why would a PPP packet driver
emulate a class 1 driver and not a class 6 driver? The major difference
between the two in terms of presented data is the presence of MAC
addresses and non-IP packets. The differences in behavior that follow
from this are more significant. One is emulating a broadcast medium
on a point-to-point connection. The other is emulating a point-to-point
connection of somewhat lesser capabilities, but still enough for
straight IP (meaning ICMP, TCP).
> I was hoping that we can figure out what more does Kermit expect from a class
> 1 emulator compared to other TCP apps (and you're starting this, with the 3
> conditions above). Now I'll try from the other end, ask emulator authors what
> less do these emulators provide compared to true ethernet drivers.
I would suspect that much of it has to do with ARP and other such
broadcast things (especially ARP, since it's a different protocol type
than IP.) On ethernet you do arp, or you're not doing it right. On
PPP, you do some minor negotiation at connect time, but you don't do
ARP per se.
David.
--
David Lane dlane@contactpt.com
Senior Software Engineer http://dlane.contactpt.com
Contact Point Technologies http://www.contactpt.com