Intermittent IPv6 reachability in Singapore (SIN1)

Affected:

Network · SIN1

Duration

55 min

Reference

inc-20251218-1

Timeline

1. Resolved18 Dec 2025, 17:53 UTC

   Resolved. IPv6 reachability is fully restored; the filter change process now requires a second review.

2. Monitoring18 Dec 2025, 17:33 UTC

   All IPv6 prefixes are back in the routing table. We are verifying reachability from every rack.

3. Identified18 Dec 2025, 17:07 UTC

   A route filter update dropped a set of IPv6 prefixes learned at SGIX. The filter has been corrected and sessions are being re-announced.

4. Investigating18 Dec 2025, 16:58 UTC

   Some customers report IPv6 destinations being unreachable from Singapore (SIN1). IPv4 is unaffected.

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