hangs:Socket::IPSocket#recvfrom using IPv4 allows specifying of flags when receiving data
hangs:Socket::IPSocket#recvfrom using IPv6 allows specifying of flags when receiving data
fails:Socket::IPSocket#recvfrom using IPv6 returns an Array containing up to N bytes and address information
fails:Socket::IPSocket#recvfrom using IPv6 using reverse lookups includes the hostname in the address Array
