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11. Internet Access Rebuild > Existing Network
Existing Network
Did I mention that the existing network was a home-grown construction? Well, the architecture proved it. All traffic entered the network from a dark fiber link that ran between hosting company and a peering point across the street. The fiber was terminated in a 10 Gbps port on a Layer 2 switch. From this point, the circuits fanned out to the Internet border routers and to the server farms. A loose interpretation of the network is shown in Figure 11-1.
The traffic from the servers passed through a top-of-rack (ToR) switch to the central switch, and then to the router, back to the central switch, and off to the Internet.
The network was wide open to attacks; it had single points of failure and traffic patterns that would make a cloverleaf look straightforward.
