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LIF is no longer listening on DNS port

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ontap-9
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CORE
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Applies to

  • ONTAP 9
  • DNS

Issue

  • ONTAP maintains DNS load balance.
  • The DNS Server notices the following error.

connection refused resolving "domain.com/AAAA/IN" 192.168.200.1#53
connection refused resolving "domain.com./A/IN" 192.168.200.1#53

  • LIF is no longer listening on the DNS port. And observe that the DNS queries received ICMP Port unreachable responses in the packet trace.

1       2022-04-15 12:00:55.172117     0.000000       192.168.34.6       192.168.200.1 DNS     81      Standard query 0x0673 A domain.com
2       2022-04-15 12:00:55.172152     0.000035       192.168.200.1       192.168.34.6 ICMP    70      Destination unreachable (Port unreachable)

  • DNS port is non-reachable.

[root@centos ~]# telnet 192.168.200.1 53
Trying 192.168.200.1...
telnet: connect to address 192.168.200.1: Connection refused

 

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