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Spoofing alerts coming from InterCluster LIFs

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127
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0
Category:
ontap-9
Specialty:
dp
Last Updated:

Applies to

  • ONTAP 9
  • Firewall alerts

Issue

  • Following errors reported from unknown IP addresses:
[Node_A1: kernel: csm.connectionFailed:debug]: CSM failed to create a connection: localBladeUUID = xxxxx:dblade,
remoteBladeUUID = xxxxxx:dblade, uniquifier = 0e05e9bf38812f41, transportType = CT,localVifId = 1026,
remoteVifIP = xx.xx.xx.xx, CsmError = CSM_CONNTIMEOUT, ctLoError = CTLOPCP_ERR_UNKNOWN, socketError = 60, and TLSerror = 0.
  • cluster peer ping show unreachable addresses:

Example :

::> cluster peer ping -originating-node xxxx -destination-cluster xxxx
Node: xxxxx          Destination Cluster: xxx
Destination Node IP Address       Count  TTL RTT(ms) Status
---------------- ---------------- ----- ---- ------- -------------------------
Node_B1        <Known IP>          1   64  33.774 interface_reachable
Node_B1        <Unknown IP>        1    -       - unreachable
Node_B2        <Known IP>          1   64  33.807 interface_reachable
Node_B2        <Unknown IP>        1    -       - unreachable

  • cluster peer show -instance displaying unused/unknown IP address:

Example:

::> cluster peer show -cluster Node_B 

                       Peer Cluster Name: Node_B
           Remote Intercluster Addresses: 10.61.66.52, 10.61.66.53
      Availability of the Remote Cluster: Available
                     Remote Cluster Name: Cluster_B
                     Active IP Addresses: 10.61.66.53, 10.61.66.52, 1.1.1.1, 1.2.2.2
                   Cluster Serial Number: 1-80-000012
                    Remote Cluster Nodes: Node_B1, Node_B2

  • External firewall can detect those as "Spoof logs"

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