Single Point of Failure

The Tower Bridge Lifeboat station put up a picture on Twitter of what London would look like today if the Thames Barrier wasn’t closed.

I’ve annotated it with the four biggest nodes from the London Internet Exchange.

It’s not known exactly what fraction of UK Internet traffic passes through these four buildings, but almost every major ISP or content provider exchanges traffic there, Mythic Beasts, Facebook, Twitter, Google, BT, Virgin, Yahoo, Microsoft, Akamai, Netflix, Talktalk, BSkyB, Vodafone, and hundreds of others. Very slowly regional exchanges are starting to be built, largely by LINX itself.