The in.chargend service provides the server-side of the character-generator protocol. This protocol is used for debugging and bandwidth measurement and is available on both TCP and UDP transports, through port 19.
Once a connection is established, the in.chargend generates a stream of data. Any data received is discarded. The server generates data until the client program terminates the connection. Note that the data flow is limited by TCP flow control mechanisms.
The in.chargend listens for UDP datagrams. When a datagram is received, the server generates a UDP datagram in response containing a random number of ASCII characters (ranging from 0 to 512 characters). Any received data is ignored.
The in.chargend data consists of a pattern of 72 character lines containing the printable, 7–bit ASCII characters. Each line is terminated with a carriage return and a line feed character.
See attributes(5) for descriptions of the following attributes: