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ARP遅延によるDNSタイムアウトアラート

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ontap-9
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nas
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環境

  • ONTAP 9
  • ネットワーキング
  • DNS

問題

  • ONTAPクラスタは、DNSサーバにアクセス可能な場合でも、DNSサーバのタイムアウトイベントが繰り返し発生することを報告する場合があります。
  • 次のEMSログが記録されます:
    [NodeA:mgwd:dns.server.timed.out:error]: DNS server 10.2xx.1x.94 did not respond to vserver=svm1 within timeout interval.
  • パケットトレース分析では、ONTAPクラスタがDNSサーバへのアクセスを試みた場合、ARP要求と応答の間に3秒の遅延が見られます。

5682  2025-11-12 02:18:51.134503Z NetApp_XX:XX:XX  Broadcast  ARP  42  Who has [IP_A]? Tell [IP_B]
5683  2025-11-12 02:18:54.140042Z VMware_XX:XX:XX  NetApp_XX:XX:XX  ARP  60  [IP_A] is at [MAC_A]
5684  2025-11-12 02:18:54.140051Z  [IP_B]  [IP_A]  DNS  90  Standard query 0x33e2 A test.local
5685  2025-11-12 02:18:54.142675Z  [IP_A]  [IP_B]  DNS  106  Standard query response 0x33e2 A test.local A [IP_C]

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