::memset(&addrout, 0, sizeof(struct sockaddr_in));
addrout.sin_family = AF_INET;
addrout.sin_addr.s_addr = ::inet_addr("225.0.0.37");
addrout.sin_port = htons (base_port);
::memset(&addrout, 0, sizeof(struct sockaddr_in));
addrout.sin_family = AF_INET;
addrout.sin_addr.s_addr = ::inet_addr("225.0.0.37");
addrout.sin_port = htons (base_port);