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
DComTalk.com
Discussion of VoIP, VPN, Video Conferencen, DSL and other data commucations.
Using Ethernet cards to create arbitrary frames?
7 posts
• Page 1 of 1
Using Ethernet cards to create arbitrary frames?
by Herbert Haas » Wed Oct 26, 2005 11:20 am
- Herbert Haas
Re: Using Ethernet cards to create arbitrary frames?
by William P.N. Smith » Thu Oct 27, 2005 1:02 am
Herbert Haas <haas@removethis.astro.removethat.univie.ac.at> wrote:
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.
Does anybody know if Ethernet NICs can be misused to create
arbitrary frames?
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.
- William P.N. Smith
Re: Using Ethernet cards to create arbitrary frames?
by Herbert Haas » Thu Oct 27, 2005 9:45 am
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
Herbert Haas <haas@removethis.astro.removethat.univie.ac.at> wrote:
Does anybody know if Ethernet NICs can be misused to create
arbitrary frames?
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.
Is it also possible to create non-Ethernet headers?
For example 2-byte address fields, etc...
Thanks
Herbert
- Herbert Haas
Re: Using Ethernet cards to create arbitrary frames?
by Manfred Kwiatkowski » Thu Oct 27, 2005 11:20 am
In article <pan.2005.10.27.09.45.04.799875@removethis.astro.removethat.univie.ac.at>,
Herbert Haas <haas@removethis.astro.removethat.univie.ac.at> writes:
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.
Manfred Kwiatkowski kwiatkowski@zrz.tu-berlin.de
Herbert Haas <haas@removethis.astro.removethat.univie.ac.at> writes:
Am Wed, 26 Oct 2005 21:02:57 -0400 schrieb William P. N. Smith:
Herbert Haas <haas@removethis.astro.removethat.univie.ac.at> wrote:
Does anybody know if Ethernet NICs can be misused to create
arbitrary frames?
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.
Is it also possible to create non-Ethernet headers?
For example 2-byte address fields, etc...
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.
--
Manfred Kwiatkowski kwiatkowski@zrz.tu-berlin.de
- Manfred Kwiatkowski
Re: Using Ethernet cards to create arbitrary frames?
by glen herrmannsfeldt » Fri Oct 28, 2005 3:20 am
Manfred Kwiatkowski wrote:
(snip)
Not to mention, if I remember right, that ethernet includes
a version with 16 bit addresses.
-- glen
(snip)
Is it also possible to create non-Ethernet headers?
For example 2-byte address fields, etc...
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.
Not to mention, if I remember right, that ethernet includes
a version with 16 bit addresses.
-- glen
- glen herrmannsfeldt
Re: Using Ethernet cards to create arbitrary frames?
by Rich Seifert » Fri Oct 28, 2005 11:20 am
In article <6f6dnRAsbdkkMPzeRVn-rA@comcast.com>,
glen herrmannsfeldt <gah@ugcs.caltech.edu> wrote:
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
glen herrmannsfeldt <gah@ugcs.caltech.edu> wrote:
Not to mention, if I remember right, that ethernet includes
a version with 16 bit addresses.
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
- Rich Seifert
Re: Using Ethernet cards to create arbitrary frames?
by William P.N. Smith » Fri Oct 28, 2005 11:20 am
Herbert Haas <haas@removethis.astro.removethat.univie.ac.at> wrote:
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...
Is it also possible to create non-Ethernet headers?
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...
- William P.N. Smith
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