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In our environment we only have one network adapters for the Replicas and IPV4 is being used. By default the IPV6 is also enabled. My question is will there be any problems if I unchecked IPV6 from the Adapter properties

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  • Why fiddle if there is no issue and everything is running fine ?
    – Kin Shah
    Nov 1, 2018 at 14:47
  • Application is going slow at a certain period of time. Vendor asking if we can disable it. Nov 1, 2018 at 14:52
  • That means they are stalling because whoever you are talking to doesn't know what is going on. I would immediately escalate upon receiving such a request from a vendor. Especially since I know I'm using IPv6 and disabling it would interrupt production services. Nov 1, 2018 at 15:37
  • the cluster is only using ipv4 not ipv6 but it was enabled as part of the default seryp. Nov 1, 2018 at 16:54

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My question is will there be any problems if I unchecked IPV6 from the Adapter properties

Do not disable it, specially if you are not having any issue. WSFC does use IPV6 both for internal communication and can also be used for public network communication. Plus even if you disable IPV6 it is highly unlikely that cluster would not work or start giving some issue. I am sure that even if you disable IPV6 the WSFC would work but may be other network functionality might be affected since network is beyond scope of discussion I am not sure what might be affected but WSFC will work.

I would quote from Failover Clustering and IPv6 in Windows Server 2012 R2

Should IPv6 be disabled for Failover Clustering?

The recommendation for Failover Clustering and Windows in general, starting in 2008 RTM, is to not disable IPv6 for your Failover Clusters. The majority of the internal testing for Failover Clustering is done with IPv6 enabled. Therefore, having IPv6 enabled will result in the safest configuration for your production deployment.

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