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EMS event "netif.tcp.conn.bad.checksum"

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ontap-9
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nas
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環境

ONTAP 9.11.1以降

問題

  • The following EMS message appears.
Mon Sep 26 02:09:05 +0900 [node01: kernel: netif.tcp.conn.bad.checksum:error]: TCP packet with bad checksum detected on port e0c. The packet arrived on connection with source address xx.xx.xx.xx and destination_address xx.xx.x.xx.
  • Bad TCP cksum is also increasing on port ::> system node run -node node_name -command ifstat port_name.

-- interface  e0c  (40 days, 5 hours, 34 minutes, 37 seconds) --
RECEIVE
Total frames:     2047m | Frames/second:     589  | Total bytes:      2625g
Bytes/second:      755k | Total errors:        0  | Errors/minute:       0
...
LRO bytes:        2527g | LRO6 segments:       0  | LRO6 bytes:          0
 Bad UDP cksum:       0  | Bad UDP6 cksum:      0  | Bad TCP cksum:      21
 Bad TCP6 cksum:      0  | Mcast v6 solicit:    0  | Lagg errors:         0
...

  • 解決に進む前に、以下のトラブルシューティング手順を実行できます。
    • ifstatでCRCエラーがないか確認し、CRCエラーが見られる場合はポートに接続されているケーブル / SFPのトラブルシューティングを行います。
    • ifstatでCRCエラーが報告されない場合:
      • If only one client is reported in the EMS message, investigate that client
      • If there is no change in the client, investigate the device between the client IP and LIF described in the EMS message
      • Ensure that the correct MTU is set on all interfaces (storage, switch, host)
  • 注:TCPの不正なチェックサムを確認するために、ストレージ、接続されているスイッチポート、およびクライアントの影響を受けたポートから同時にtcpdumpまたはパケットトレースを収集します現在のところ、貢献者を除外したり、原因を特定したりするための他の既知の方法はありません。

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