On Wed, Apr 27, 2016 at 09:57:36AM -0300, Adriano dos Santos Fernandes wrote:
> >
> Firebird is not probably (I think) the unique application in the world
> connecting via tcp (ipv4 or ipv6) to things. Or is it?
Definitely not.
> Is the problem happening with other applications and how they are
> solving it or not?
I'm not familiar with the situation on Windows but few years ago when
linux distributions started to have IPv6 enabled by default and popular
websites started to provide AAAA records (and serve IPv6 requests), this
type of problem was observed quite often. To my knowledge, the solution
mostly was to either disable IPv6 or adjust /etc/gai.conf to prefer IPv4
addresses on hosts without IPv6 connectivity, sometimes also adjusting
firewalls so that outgoing IPv6 fail properly rather than being silently
dropped. Some client applications also provide means to enforce IPv4
(e.g. '-4' command line option or a configuration directive).
Michal Kubecek
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