[Snort-users] Re: Wiring a "read only" cable

Chris Grout cgrout at ...3649...
Thu Nov 29 15:44:02 EST 2001


There's a couple of way to make a "receive only" cable.  Clipping wires
or pins on a regular CAT3/5/6 cable will not work (afaik).  You won't be
able to maintain link, and therefore the hardware at both ends will shut
the connection down.  The best method is to use a modified AUI - RJ45
adapter.  With these you will still maintain link, receive 100% of the
traffic, yet the system will not be able to send  a single outbound
packets.  The other way is to untwist the transmit wires only and
inducing enough problems on the wire so that the packets are totally
mangled.  Obviously, this method is like cutting out the tongue of the
system.  It certain can still make noise and could be detected.

I have a number of these modified AUI adapters that I was planning to
throw on ebay or something.  Let me know if anyone wants one.

-----Original Message-----
From: snort-users-admin at lists.sourceforge.net
[mailto:snort-users-admin at lists.sourceforge.net]On Behalf Of Flowers,
Jay
Sent: Thursday, November 29, 2001 2:41 PM
To: 'snort-users at lists.sourceforge.net'
Subject: RE: [Snort-users] Re: Wiring a "read only" cable


So that doesn't work?

Jay Flowers
Integic Health Care


-----Original Message-----
From: Joe Pampel [mailto:joe at ...3851...]
Sent: Thursday, November 29, 2001 4:30 PM
To: snort-users at lists.sourceforge.net;
snort-users-request at lists.sourceforge.net
Subject: [Snort-users] Re: Wiring a "read only" cable

What am I missing here?

Trying to make a read only 100Base-T cable for a sensor and it has 8
pins -
4 pairs. So far so good.
www.silicondefense.com has a schematic showing 14 pins and cutting pins
3
and 10...

Can you see my confusion?  My understanding of this kind of connector is
like this:
from : http://yoda.uvi.edu/InfoTech/rj45.htm

-----------------------------------------------------------------------
Pin Number Designations

   Color Codes for T568B
Pin     color  pair  name
---     -----  ---- ---------
1       wh/or   2   TxData +
2       or      2   TxData -
3       wh/grn  3   RecvData+
4       blu     1
5       wh/blu  1
6       grn     3   RecvData-
7       wh/brn  4
8       brn     4

------------------------------------------------

This would indicate not crimping the Orange pair to pins 1 & 2. And of
course if you're a wise-guy you put a splitter on the jack and plug an
RJ-11
in and use the middle pair for a POTS line.. but anyhow... ;-)
Anyone else run into this?

ps: wiring sucks when you're color blind. :-)

- Joe


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