static void register_tcp_test_ipv6_to_ipv6_with_ipv6(void){
	if (!belle_sip_tester_ipv6_available()){
		belle_sip_warning("Test skipped, IPv6 connectivity not available.");
		return;
	}
	register_test_with_interfaces("tcp","::0","::0",AF_INET6);
}
static void register_tcp_test_ipv6_to_ipv6_with_ipv6(void){
	register_test_with_interfaces("tcp","::0","::0",AF_INET6);
}
static void register_test_ipv6_to_ipv6_with_ipv4(void){
	register_test_with_interfaces("udp","::0","::0",AF_INET);
}