Passive Ethernet Tap

Just use an ordinary UTP cable

Connect 4 walloutlets to the cable as shown below.

Use the straight-through cable if you tap an ordinary switched network

Use the cross-over cable if you tap an PC directly connected to another network

The results may looks lik this


Place you tap (8 wired walloutlets) between a PC and the network

Connect your sniffer with two interface to the 2-wired walloutlets.

Put both interfaces is promiscious mode and start the capture on both interface