DDoS against UltraDNS

The Washington Post has an interesting article about a Distributed Denial of Service (DDoS) attack against UltraDNS, a provider of domain name services.

It’s a chilling read. If you’ve wondered why recently, some popular websites appear to be mysteriously offline, this may provide some of the answers.

The most unsettling bit is that there doesn’t seem to be any obvious way to defend against this sort of attack.