A major CenturyLink/Level 3 outage on Sunday that took down websites across the US and EU has been blamed by the carrier on an “offending flowspec announcement” — an encoding format typically used to block malicious DDoS attacks. CenturyLink, one of the world’s largest network providers, bought Level 3 , a Tier 1 core transport, IP, and content delivery provider for $34 billion in 2017.

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