Who says golf is boring? Tiger Woods’ U.S. Open win this week caused measurable traffic spikes in the U.S.A., with numerous ISPs apparently initially believing the spikes to be a denial of service attack.

You can read the full story here, but here’s the summary:

Starting around 9 am Pacific and peaking at 1:30 pm yesterday, many ISPs noticed an unusual increase in traffic. At first, a few security engineers worried they were under some type of new DDoS attack. But the flood of traffic did not appear directed at any individual customer — the gigabits of anomaly traffic surged to almost all customers from multi-national banks to the bakery down the street and home DSL / Cable users. For several ISPs, traffic into their network grew by 15-25%. In one provider, inbound traffic nearly doubled.

It turns out that the U.S. Open played at Torrey Pines yesterday generated one of the larger Internet-wide flash crowds this year. Traffic dipped and peaked corresponding to Tiger’s initial
misses and subsequent spectacular comeback as millions of office bound fans tuned in to the live NBC and ESPN coverage.