CLIENTPORT
RL(rv = sock_bind(client, "0.0.0.0", CLIENTPORT));
RL(rv = sock_bind(client, "127.0.0.2", CLIENTPORT));
other = udp_server("127.0.0.2", CLIENTPORT);
RL(rv = sock_bind(client, "127.0.0.3", CLIENTPORT));
RL(rv = sock_bind(client, "127.0.0.2", CLIENTPORT));