For a start, it is not possible to filter Internet traffic automatically for its country of origin.

ECONOMIST: Finance on the Internet

But many organizations do not feel comfortable having a third party filter all their traffic and do not need the data distribution of a CDN.

FORBES: DDoS: coming to a network near you

The panel of cycling advocates suggested filter systems at traffic lights, priority lanes at roundabouts and for greater private sector involvement, for example getting firms to sponsor cycle lanes or highways.

BBC: Transport Committee

If the lights weren't there, naturally we would approach slowly and carefully and see what other people were doing and filter through, but the traffic lights make us speed up to beat them.

BBC: Viewpoint: Is it time to get rid of traffic lights?

If that is a concern, then they do need to work with their internet service provider, and perhaps with a cloud-specialty anti-DDoS provider, because those organizations have infrastructures and massive amounts of internet bandwidth which can actually absorb gigantic attacks, filter out the majority of malicious traffic, and then send the good stuff through to the end user.

FORBES: DDoS Defense: Preventing business disruption

As I turned back onto the I-90 towards Toledo and eventually Detroit, after a nutritious burger and fries, a filter took cars onto the interstate across a lane of oncoming traffic.

BBC: The selfless America outsiders don't see