How has Concentric Implemented Traffic Isolation?
The technical description of Concentric’s DSL traffic isolation implementation is that although the DSL modems are configured in bridged mode, Concentric uses separate virtual circuits for each customer DSL modem, and enforces no-bridging at the device that terminates the virtual circuits. No ARP broadcasts are ever forwarded from one customer to another. And Source Routing is not allowed, preventing spoofing of IP addresses.
