Any recommendations for a passive (inline) network TAP to monitor traffic? It is for personal use and learning. Willing to buy used to save money. I have seen a few of these on eBay but not sure what brand/model to purchase. I am running 1G network, was going to insert the TAP inline after the FW to test internal traffic. So probably just need one with four ports. One for ingress traffic, one port for egress, and two for monitoring.