Dear Valued Customer,
Since August 12th, you and your users may have experienced major issues with connectivity to various websites and services, including email, Voice over IP phone service, and Envision’s Cloud Desktop platform. This disruption is a result of a problem affecting multiple large and small Internet Service Providers (ISPs) from around the world including Level 3, Verizon, Comcast, Cogent and more.
The nature of the problem is related to how these ISP’s top-level Internet routers map out the Internet to handle the routing of traffic from a given computer to a destination server and back. These maps are known as routing tables and some older models of router suffer from a memory limit to how many routes they can track simultaneously.
Due to the growth of the Internet at large, the number of routes needed to map everything on the Internet has outgrown the limits of these routers, resulting in the outages we have all been experiencing. The ISPs in charge of these routers have been acting swiftly to correct the problems and their networks have been stabilized. Please be aware that some lingering issues may remain as they continue to work to update their routers.
As of this writing most ISPs have not publicly commented on the outages but if you wish to learn more about this issue you can read a good account of it here:
Or another explanation here: http://www.bgpmon.net/what-caused-todays-internet-hiccup/
Unfortunately there’s not much else we can do at this time, but if you have any questions or concerns about this matter, please contact email@example.com and we will be happy to address them.