Date: Thu, 11 Jul 1996 08:20:06 -0400 From: "Jacob M. Parnas" <jparnas@jparnas.cybercom.net> To: dunn@harborcom.net Cc: hardware@freebsd.org, bsdi-users@bsdi.com Subject: Re: cable vs. ISDN Message-ID: <199607111220.IAA02173@jparnas.cybercom.net> In-Reply-To: Your message of Thu, 11 Jul 1996 01:41:43 CDT. <199607110547.BAA05849@ns2.harborcom.net>
next in thread | previous in thread | raw e-mail | index | archive | help
In message <199607110547.BAA05849@ns2.harborcom.net>you write: >On 11 Jul 96 at 0:04, Jacob M. Parnas wrote: > >> As pointed out earlier, isn't ethernet tcp/ip based or some other network >> protocol based. What if one wants to communicate below that level? >> Otherwise, if its inexpensive enough, fast enough and doesn't use unnecessary >> hardware, I think it would be fine. > >I do not quite understand what you mean here. Ethernet as I >understand it means the IEEE 802.3 protocols, which specify both the >physical and data link aspects of network communication. AFAIK, you >cannot communicate "below" the physical layer. :) > >The 802.3 protocols are not "tcp/ip based". Sure TCP/IP can be run on >top of them, but the IP spec stops at the network layer, it does not >specify anything at the data link or physical layers. > >Bradley Dunn <dunn@harborcom.net> >Harbor Communications > I guess what I mean is that when you're trying to get very low overhead response (like for kernel debugging), why add a whole layer of work putting a something into an IP format, turning it into serial (when it was serial to begin with), or vice versa (reading every serial input as an IP packet and turning it into a serial character, when it was that way in the first place? At that time uucp was used a lot (or was about to be). I don't see how putting something serial into an IP packet to something serial and vice versa makes sense. Everything would be etherneted (like serial mice, keyboards, terminal output, etc). It seems like a fairly expensive way to do things, but I could be wrong. I agree that the way it was done left much to be desired. Jacob Parnas
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199607111220.IAA02173>