There is an issue on the SFR collect in the South of France.
A ticket has been opened, the investigations are underway on their side.
Update(s):
Date: 2013-10-18 17:58:23 UTC Thereafter switching, a modem reboot could be necessary in order to recover the connection.
Date: 2013-10-18 14:34:00 UTC The fault has been identified on the Bordeaux BAS.
SFR has just switched onto an emergency BAS.
The connections are going back up gradually since 15:55.