h = GNUNET_NAT_register (cfg, is_tcp, dport, 0, NULL, NULL, NULL, NULL, NULL);
memset (&sa, 0, sizeof (sa));
sa.sin_family = AF_INET;
h = GNUNET_NAT_register (cfg, is_tcp, dport, 0, NULL, NULL, NULL, NULL, NULL);
memset (&sa, 0, sizeof (sa));
sa.sin_family = AF_INET;