Cogent/TeliaSonera peering “issues”
Until last Friday, Cogent and TeliaSonera were in a bilateral peering relationship, meaning they exchanged traffic between their networks for free.
By what is known at the moment, it looks like Cogent is at the origin of the problem. They have decided to end the peering agreement no longer exchange traffic with TeliaSonera. The consequence is that people with Cogent only connectivity are no longer able to connect to sites on teh telia network, and vice-versa.
There is no official word yet from Cogent, but Telia has informed their customers and blames Cogent. Funny enough they basically recommend to their Transit customers to buy additional Upstream from a second ISP to get around the issue. Interesting approach.
It isn’t the first time that Cogent finds itself in a peering fight. In 2005 Level3 de-peered Cogent, the same year OpenTransit de-peered Cogent and I could continue to go on.
It shows unfortunately yet again one thing: Don’t rely on a single provider if you want reliable connectivity! get multihomed to at least to different Transit providers!
We will provide you with more updates on the current situation as soon as further details appear.
Further coverage:
GigaOm
Nanog