[tptacek]

To monitor their own networks, which are gigantic. The top tier of the finance market had networks so complicated and sensitive that they would surprise us and buy Arbor Networks products that were designed for AT&T's backbone. Some of them even needed the BGP monitoring stuff we'd been doing.

These companies (Reuters included) basically run their own facsimiles of the Internet, but to carry money instead of cat pictures. Their network monitoring needs are intense.