Incident Library

Organisation

Cisco ThousandEyes

Cisco ThousandEyes · cisco-thousandeyes

1 case · 2025

Root cause Software defect
Component conntrack tableCoreDNSIstiokube-proxy
Contributing factor Unreviewed defaults
Symptom DNS resolution failuresOOMKilledStale endpoint routing

Cases

  1. IL-0104 After a CoreDNS pod was OOMKilled, the talk names three causes: Istio's aggressive DNS cache refresh on one reused client port, kube-proxy not cleaning up conntrack entries of terminated pods, and the 2-minute UDP conntrack timeoutCisco ThousandEyes · 2025

    Root cause Software defect