Echo (network service)
| application | echo | ||||
| transport | UDP | TCP | |||
| Internet | IP ( IPv4 , IPv6 ) | ||||
| Network access | Ethernet |
Token bus |
Token ring |
FDDI | ... |
The Echo Network Service is a simple service in the Internet protocol family . The task of the service is to send all received data back to the client unchanged . It is therefore suitable for testing and troubleshooting during the development of client programs.
The echo service is TCP and - UDP - Port 7 reserved. The echo protocol is specified in RFC 862 .
In Unix systems, the echo service - just like the other simple network services ( daytime , discard, etc.) - is usually implemented directly in inetd . In Windows systems, these network services are located in the optional Windows component Simple TCP / IP services .