This tools runs on the linux-i386. You can use it to connect the virtual routers in one window, and switch the router console from one to another freely. The console tcp port starts from 2000 If you did not modify them. MTTYs accepts the keyboard input and resend to the 'telnet'.
Please run the dynamips and load/start the ios before use the internal command to connect the routers. The telnet command executed by MTTYs will hang up if the port has been connected. Don't worry, press Ctrl+x to switch to the main console and run kill command to close this session.