Date: Wed, 7 Oct 1998 21:59:09 +0200 (CEST) From: Andre Albsmeier <andre.albsmeier@mchp.siemens.de> To: luigi@labinfo.iet.unipi.it (Luigi Rizzo) Cc: hackers@FreeBSD.ORG Subject: Re: How to send data between two network cards directly? Message-ID: <199810071959.VAA02775@internal> In-Reply-To: <199810071518.QAA08692@labinfo.iet.unipi.it> from Luigi Rizzo at "Oct 7, 1998 4:18:42 pm"
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> > > > together via 10Base2. I would like to send data from one > > > > machine two the other without doing IP or any other > > > > protocol. > ... > > OK, maybe I desribed it in a wrong way. I would like to use > > the most basic protocol that is available. No overhead, > > no error correction, no nothing... > ... > > I have got two wireless-lan-like developer boxes. They got each an UTP > > port and transmit data via a direct spread spectrum frequency hopping > > protocol. We have two compare their performance, errors and reliabilty > > with other, for example RS232 or S0 bus based, boxes. They run the ethernet > > protocol (ok, this is the lowest level protocol, I have to use) and I would > > like to transmit data without running TCP,UDP or something else. > > then for your purposes, UDP or raw ethernet packets are absolutely > equivalent. I think I will stick with the raw packets first and see how it is working. I still don't know exactly what I have to expect since I don't have much infos about the internal of these boxes. These are only some experimental test and, as you can imagine, I will have to do some comparisons with the RS232 and S0 bus stuff so it's actually comparing apples with pears as we say in germany :-) > > if you really want to see things in detail you might try to disable UDP > checksums (i think this is a socket-level option, isn't it ?) > or even pass up bad frames from the ethernet driver (either > use bpf, or play with the ethernet driver) Yes the bpf was also coming on my mind but I still haven't got much experience with it (from a programers point of view) and I have to get this thing running in a short time. > > cheers > luigi Thanks a lot for your help, -Andre To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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