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5d41d476f3
In order to ease dual-stack deployments, we could at least try to check if ipv6 seems to be reachable. For this we're adding a test based on a UDP connect (no traffic) on port 53 to the base of public addresses (2001::) and see if the connect() is permitted, indicating that the routing table knows how to reach it, or fails. Based on this result we're setting a global variable that other subsystems might use to preset their defaults.