The OS needs an extra feature, and then clients need to make use of that feature. There's other workarounds listed in the "Mitigations" section of the post. But the problem is basically that everything is working as intended, for example if you disable the "Option 121" feature then under certain circumstances you might not have internet connection. Apparently Android devices don't support Option 121 at all, and it makes them unaffected by this vulnerability, but also causes to sometimes not be able to connect to networks.
