It might seem strange, but why enable IP6 at all? Poorer security, more bugs and there is nothing I know of using IP6 not available on IP4.
Few domestic router/modems have any IP6 security settings, so every IP6 device on your LAN is visible to all the usual privacy thieves.
I know we are theoretically running out of IP4, but we won't for a long time as US Gov, Universities and big US corps have 10s or 100s of millions of unused or wasted IP4.
IP6 still needs more work.
Even privacy was a fudged after thought.
There is no reason to use it unless you are paid tester, or Facebook, Google etc wanting to acquire more personal & private info.
Disabling IP6 on everything is more secure, less buggy, faster and everything works.
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