Github user wido commented on the pull request:
https://github.com/apache/cloudstack/pull/1488#issuecomment-208811822
At PCextreme we have 'ipv6disabled' set to 'false' on our hypervisors and
they are all connected over IPv6.
Connections we see open from the Management Server to the Agent:
<pre>root@man:~# netstat -nap|grep ESTABLISHED|grep 8250
...
tcp6 0 0 2a00:f10:ff02::825:8250 2a00:f10:10a:XX:XX:58704
ESTABLISHED 3626/jsvc.exec
...
root@man:~#</pre>
Our testing has been done in the real world. This change is just so that a
IPv6-only hostname for a Management Server works.
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