[icedchai]

This sounds like most of the early ISPs I worked at. No firewalls, and switches weren't popular yet, so we had hubs. The "backbone" of the ISP network was the same as the main office network. Any employee could just tcpdump all the traffic. Actually, we had a couple of customer-owned servers that were colocated, that could also dump all the traffic. Eventually someone set up a firewall (Linux box with dual ethernets) to segment the colo traffic.