IPv6 connectivity outage [2013-02-26 10:17 CET, update 2, solved]

There is currently an unplanned outage of our IPv6 connectivity in the data center ongoing.

We are working with our uplink providers to restore connectivity.

IPv4 connectivity is not affected, however, services that rely on outside services that provide double-stack networking (IPv4+IPv6) may experience timeouts and delays.

We will post updates here as we work towards a solution.

We are sorry for any inconvenience.

[Update 1 - 11:52 CET]

The cause seems to have been in the data center upstream router infrastructure. We are getting improvements and see traffic on IPv6 picking up again. We do know of a couple of remaining edge cases and continue to work on restoring full connectivity soon.

[Update 2 -14:51 CET, solved]

IPv6 connectivity has been restored. Some nodes are still recovering from the outage but we are seeing continuous improvement in our monitoring.

The root cause was traced to a Cisco IOS bug involving more than 10.000 IPv6 routing entries and our upstream provider has implemented a work-around for the problem. We expect network maintenance some time in the next weeks to provide a fixed IOS version at the network operator's equipment.