Firebird3 - Disable ipv6 support option when no network connection
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                 Key: CORE-6349
                 URL: http://tracker.firebirdsql.org/browse/CORE-6349
             Project: Firebird Core
          Issue Type: Improvement
    Affects Versions: 3.0.5
         Environment: Windows 10, Delphi 10.3.3, FireDAC
            Reporter: Eric Himmer


Related to CORE-5679.

Our product is designed for use by computer illiterate people using Windows 
devices most likely not connected to the internet.  Based on the report in bug 
report CORE-5679, support was added for ipv6 which causes a failure to be able 
to connect to the local database on a localhost without an internet connection 
unless a user, makes changes to their Windows settings.  This is not something 
our users are likely capable of doing, especially out in the field with no 
internet connection.

Can a setting be added to override the ipv6 support when there is no active 
internet connection?  This is truly a show stopper for us.  Not easy for us to 
back down to FB 2.5 at this late stage.  I did not notice any warning in the 
FB3 description that FB3 requires an internet connection even for embedded-like 
usage unless you disable Windows Media Sense by using RegEdit and adding the 
DisableDHCPMediaSense key to disable it and not sure if I want our setup to 
disable something in Windows itself that the user or other applications might 
want enabled:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters

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