Level3 and AT&T appear to be having ongoing issues over the last couple days . The outage you have experienced is centered around one of their route-servers located in the DFW area. We are continuing to track the issue and continuing to track the resolution. The Level3 Communications master case number is 40976066
Level3 Communications and AT&T Ongoing Issues | Outage Experienced
Aug 1, 2011 – Some Dotcom-Monitor clients may have experienced alerts due to a Level 3 Communications connectivity issue. For details see the statement below from Level 3 Communications explaining the event and the resolution.
“Much of the internet connectivity in and to the Continental United States was degraded by an outage within the Level 3 Communications backbone that began at approximately 17:22 1 August 2011 UTC. The impact of this event was felt not only on the Level3 backbone but also on other carriers as providers shifted large amounts of traffic that would have normally transited the Level3 network onto alternate network paths, causing increased latency and congestion and packet loss.”