This morning McMaster University posted the following to their website:
Difficulty in reaching some internet sites
Posted on October 06, 2005 at 03:52 PM.
Two major internet backbone suppliers, Cogent and Level 3 Communications, have abruptly stopped exchanging information with each other. Because McMaster has its primary internet connection with Cogent, certain network areas are unreachable. McMaster does have a second source of internet supply through FibreWired Hamilton.
Until this gets resolved, users are going to see a varying set of unreachable web sites, email addresses, and blocked traffic to and from sites supplied solely by Level 3 Communications. Unfortunately, there is no way to know by examining an address if that site is sole-sourced through Level 3. We hope this situation is resolved soon.
More detail can be found online.
This is why I have not been able to access Wikipedia during class. I usually run Wiki when my profs talk about topics so that I can have all the background information I need right in front of me. Due to this internet dispute, I cannot get Wiki because it is on the Level 3 network. This is very annoying to say the least.