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Network traffic sent out of an unexpected interface

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Category:
ontap-9
Specialty:
nas
Last Updated:

Applies to

  • ONTAP 9
  • Routing

Issue

  • NFS Clients  get RPC timeout when attempting mount
    • Packet captures show no SYN ACK replies for TCP session on NFS LIF
    • Packet captures show SYN ACK replies egressing out a different or management LIF
  • TCP/UDP traffic ingresses via one logical interface (LIF) and egresses out a different LIF
  • This asymmetric routing results in different network paths traversed by traffic travelling to/from the client
  • This is often seen when the SVM has a LIF in the same network as the client, such as in the below image:

clipboard_e783f7948b4280730aa196b38e92ec6a1.png

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