Hi experts, hackers.
Does anybody know if Ethernet NICs can be misused to create arbitrary frames?
As far as I know, cheap NICs don't create the frame headers by themselves rather it's the job of the SW-drivers.
I would like to do some experiments in basic data communications...
Thanks for help!
Herbert
IIRC, you can build about anything you want with the packet driver interface. I wrote some code in a previous life to saturate a 10BaseT network using some old DOS machines, but of course it was on a separate test LAN.
Am Wed, 26 Oct 2005 21:02:57 -0400 schrieb William P. N. Smith:
Is it also possible to create non-Ethernet headers? For example 2-byte address fields, etc...
Thanks Herbert
Yes. It is the standard procedure for a driver to assemble the whole frame in software. The NIC sends whatever there is and does not care for dest, source or type fields.
>(snip)
Not to mention, if I remember right, that ethernet includes a version with 16 bit addresses.
-- glen
Two-byte addresses are no longer part of the standard; the "feature" was removed in 1997 (and was never commercially implemented anyway).
-- Rich Seifert Networks and Communications Consulting 21885 Bear Creek Way (408) 395-5700 Los Gatos, CA 95033 (408) 228-0803 FAX
Send replies to: usenet at richseifert dot com
Probably, though I don't recall the details. Look up the documentation on the packet interface, it shold all be there.
BTW, if you start spewing non-ethernet stuff onto the cable, you'd have a very good chance that it's not going anywhere, as 'broken' frames (bad checksum, etc) aren't going anywhere, and probably (hopefully) won't propagate through switches...
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