The in.echod service provides the server-side of the echo protocol. This protocol is used for debugging and bandwidth measurement and is available on both TCP and UDP transports, through port 7.
Once a connection is established, the in.echod echoes any data received from the client back to the client. The server echoes data until the client program terminates the connection.
The in.echod listens for UDP datagrams. When a datagram is received, the server creates a UDP datagram containing the data it received and sends it to the client.
See attributes(5) for descriptions of the following attributes: