RE: uni-directional ethernet cable

George Gallen (ggallen@slackinc.com)
Thu, 28 Jan 1999 16:49:04 -0500


I did this by accident one time while attempting to make
a cross over cable. Create a cable and just dont have
the Tx go through. When my cable was accidentally made
that way, I was able to see traffic on the network, but
the network totally ignored me.

George Gallen
ggallen@slackinc.com

-----Original Message-----
From: Mullen, Patrick [mailto:Patrick.Mullen@GSC.GTE.Com]
Sent: Thursday, January 28, 1999 4:30 PM
To: 'linux-admin'; 'linux-net@vger.rutgers.edu'
Subject: uni-directional ethernet cable

[I am not subscribed linux-net so please cc: me in replies. ~PM]

I have a weird wiring question. I want to create an ethernet
cable for a 100baseT network which can only transmit one
direction.

The purpose for this cable is to take traffic from one or more
LANs and mirror it into another LAN where I will have a
NIDS (Network Intrusion Detection System) monitoring traffic
from all LANs. The problem is I want to keep these LANs
(technically they're VLANs on a switch) seperate and using a
simple crossover cable allowed traffic to flow in both directions,
defeating the purpose of having the VLANs split up.

Any help would be greatly appreciated.

Thanks!

~Patrick

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