Cluster has dual stack enabled. Cannot register to a PC (Nutanix)

So, you have a brand new Nutanix cluster deployed.
Now you want to register your Prism Element cluster to a Prism Central instance!

So, let’s start.

‘Register or create new’

‘Connect’

‘Next’

Fill in the appropriate fields, and hit ‘Connect’

WAIT, What is that?

Cluster has dual stack enabled. Cannot register to a PC.

Uh, so this has to do with some networking issue, I guess?

Nutanix, help.
OK, search the KB’s and we find: KB-17342

I’m on AOS 7, so that is AOS 6.5 and Newer.
Easy they give me two commands and I’m done.

manage_ipv6 unconfigure; manage_ipv6 disable

Let’s try this.
Hmm not successful.

What’s in the log?

Well, the first part is about the ‘manage_ipv6 unconfigure’. This is complaining about a gateway that cannot be removed.
The second part is about the ‘manage_ipv6 disable’. This is complaining about an ipv6 address still being present.

In KB-17342 there are all kind of commands, but none of these where a success in my environment.

This log line is interesting:
Failed to unconfigure IPv6 address on 192.168.100.171. Error: Failed to remove the default IPv6 gateway fe80::9ada:c4ff:fe86:31d4

Let’s see if this is true 😉

/sbin/route -A inet6

No nothing to see here.

sudo ip -6 route show

THERE YOU ARE!

Hmm, what if I add and delete the gateway in 1 step?

sudo /sbin/route add -A inet6 default gw fe80::9ada:c4ff:fe86:31d4 eth0 && manage_ipv6 unconfigure && manage_ipv6 disable

And success

And in Prism also visible:

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