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

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ontap-9
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環境

  • ONTAP 9.11.1以降
  • Transmission Control Protocol(TCP)
  • Internet Protocol(IP)
  • ネットワーク 

問題

  • 送信元と宛先の異なるアドレスに対して複数のnetif.tcp.conn.bad.checksum:error イベントが表示されます:
[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 10.0.0.10 and destination_address 10.0.0.1
[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 10.0.0.11 and destination_address 10.0.0.1
[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 10.0.0.12 and destination_address 10.0.0.2
[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 10.0.0.10 and destination_address 10.0.0.2
または

<LR d="10Oct2025 04:20:09" n="node-01" t="1760037609" id="1749258895/33018" p="3" s="Ok" o="kernel" vf="" type="0" seq="270937">
<netif_tcp_conn_bad_checksum_1
local_port="e0f"
source_address="10.63.255.1X"
destination_address="10.63.255.2X"/>

注:送信元アドレスは通常、クライアントアドレスです。宛先アドレスは、ノードのネットワークインターフェイス(LIF)アドレスです 

  • Bad TCP cksum は、ノード::> system node run -node node_name -command ifstat port_nameのifstatsのポートでも増加しています:

-- 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
...

  • CRC errorsifstatで報告されていません
  • すべてのインターフェース(ストレージ、スイッチ、ホスト)に正しいMTUが設定されています
  • NETSTAT_S.TXT は tcp bad チェックサムエラーを報告しています:

---- Default IPSpace ----
tcp:
Node#01:
  290056 discarded for bad checksums

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