A one-way data cable is designed to receive information but not transmit it. This makes for an undetectable but direct way to monitor traffic. Now let’s have a practise on it:
1. What we need:
- A length of Cat5 cable
- Two RJ-45 connectors
- Soldering Gun
- Crimp tool
2. Wire the end of the cable that you will plug into the sniffer as a normal patch cable using pins 1, 2, 3, and 6.
3. Modify the end that will be plugged into the switch by removing an inch or so of wire 1 and wire 2.
4. Strip both ends of the removed wires.
5. Solder wire 1 to wire 3 and wire 2 to wire 6 so that the transmit and receive wires are looped. These wires should then be carefully placed in an RJ-45 connecter and crimped.
The connection is illustrated below:
