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Re: Read Only Ethernet Cable
From: James Taylor <james_n_taylor () yahoo com>
Date: Wed, 12 Feb 2003 18:56:24 -0800 (PST)

From google...

http://www.silicondefense.com/techsupport/ro-ethernet.htm

http://www.mcabee.org/lists/snort-users/Jun-01/msg00504.html

http://www.robertgraham.com/pubs/sniffing-faq.html - 3.6
How can I create a receive-only Ethernet adapter?

You use 2 cards, one in 'read-only' promiscous mode
sniffing the wire, the other connected to the management
network (& severly restricted) to communicate with the
sensor.

Regards
JT


--- Rory <nazgul () csn ul ie> wrote:
I'm assuming here by the information you've given so if
i'm wrong please
correct me. You want to make a cable that allows the
traffic to go in one
direction. the idea being that your snort box does not
send information
just receives it. I don't think you can do this with a
special cable as
ethernet need to be able to send acks back to let the
sending side know
that it received that data. So you will need to do this
at OS level not
with a special cable. If you were to do what you were
suggesting the
sending box would send only the number of packets in the
TCP window and
that would be it (it mayt resend them but in the end it
will just be a
small set of information ). you will need to do this with
chain rules.

If my assumptions were totally wrong sorry.

cheers,
Rory

On Tue, 11 Feb 2003, Naman Latif wrote:

Hi,
Can anyone tell me how to make a Read-Only Ethernet
Cable to be used
with Snort\Sniffer

IS this correct

LAN         Snort\Switch
1          1
2          2
3----------3
4
5
6----------6
7
8

Then on both sides, connect 1&2 to eachother ?

\\ Naman




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