|  |  | A User Datagram Protocol (UDP) bomb can halt your entire internal network with a single packet. A hacker with a 300-baud modem can flood your internal network with so much information that no additional work can be done. The hacker sends a packet to one of your server's character-generator ports, spoofing as if it came from the echo port of another computer on your network. The chargen port on the first server sends characters to the echo port on the second server, which echoes them back to the chargen port on the first server. Network and servers becomes saturated and your system ceases normal operations.