Sustained UDP flood against Amsterdam (AMS1) edge

Affected:

Network · AMS1

Duration

1 h 28

Reference

inc-20250625-1

Timeline

1. Resolved25 Jun 2025, 09:55 UTC

   Resolved. Peak 610 Gbps, mitigated without dropping clean traffic. The filter set is now part of the standing policy.

2. Monitoring25 Jun 2025, 09:39 UTC

   The flood has subsided; edge CPU and latency are back to normal.

3. Identified25 Jun 2025, 08:51 UTC

   The flood is spread across several customer prefixes. Filters have been tightened to drop the amplification vectors at the edge.

4. Investigating25 Jun 2025, 08:27 UTC

   Our edge in Amsterdam (AMS1) is absorbing a UDP amplification flood peaking around 610 Gbps. Scrubbing is active; latency may increase by a few milliseconds.

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