> It seems that your problem is due to slow host name to IP address
> resolution (i.e. DNS), not with Firebird functionality.

But my 2.5 fbclient does not show this delay. So I don't assume there
is a problem with IP resolution.

> For Windows, the policy table seems to be managed with netsh command:
> https://technet.microsoft.com/en-us/library/cc740203(v=ws.10).aspx#BKMK_5
> http://www.colorconsole.de/cmd/en/Windows_Vista/netsh/interface/ipv6/add/prefixpolicy.htm

That is *much* too complicated for me and my customers. Especially
when you consider that you'd have to do that on every client computer
that wants to use a Firebird based application.

>> We might also consider extending the new connection string format
>> inet://... to variants inet4://... and inet6://... which would enforce
>> AF_INET or AF_INET6.
>
> This may be a good workaround.

If there is no other solution to come around this problem, I also
think that this would be easily understandable.

Best Regards

Stefan



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