FYI...
OpenDNS - Palo Alto – DDoS ...resolved -
http://system.opendns.com/2010/05/18/117/May 18, 2010 6:20 am UTC* - "Starting at 10:15 PM PDT... all of our global locations suffered
a significant denial of service attack. All sites withstood the attack with the exception of Palo Alto, which had
sporadic reachability issues lasting for almost 30 minutes. This interruption took our engineers longer to diagnose than it normally would have due to some difficulty removing some routing advertisements between our routers and one of our ISPs... By 10:45 PM PDT, all DNS traffic was routed to alternate locations, including Los Angeles and Seattle, which were online serving traffic the entire time... By 11:10 PM PDT, all website services returned to normal and all services were online. As with any interruption of service, we will be evaluating our procedures, capacity planning models and will ultimately take whatever steps necessary to ensure it does not happen again.
* Update: To clarify some misunderstandings, DNS was not significantly impacted at any site besides Palo Alto (even though
all sites were attacked). At Palo Alto, we have numerous connections to the Internet and peering partners and for reasons we are still investigating, one of our connections to the Internet had a prolonged service interruption and
did not behave as designed."
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http://system.opendns.com/ 
Topic: OpenDNS - DDoS ...resolved