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man pages section 8: System Administration Commands

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Updated: Wednesday, July 27, 2022
 
 

in.echod(8)

Name

in.echod - UDP or TCP echo protocol service daemon

Synopsis

/usr/lib/inet/in.echod

FMRI

svc:/internet/echo:default

Description

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.

The in.echod service is an inetd(8) delegated smf(7) service. The in.echod detects which transport is requested by examining the socket it is passed by the inetd daemon.

TCP-based service

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.

UDP-based service

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.

Attributes

See attributes(7) for descriptions of the following attributes:

ATTRIBUTE TYPE
ATTRIBUTE VALUE
Availability
service/network/legacy-network-services
Interface Stability
Committed

See Also

attributes(7), smf(7), inetadm(8), inetd(8)

Postel, J. RFC 862, Echo Protocol. Network Working Group. May 1983. https://tools.ietf.org/html/rfc862

Notes

The in.echod service is managed by the service management facility, smf(7), under the service identifier:

svc:/internet/echo:default

Administrative actions on this service, such as enabling, disabling, or requesting restart, can be performed using svcadm(8). Responsibility for initiating and restarting this service is delegated to inetd(8). Use inetadm(8) to make configuration changes and to view configuration information for this service. The service's status can be queried using the svcs(1) command.

History

The in.echod program and the svc:/internet/echo:default service were added in the Solaris 10 3/05 release. Prior to that, support for the echo service was provided as a builtin part of inetd(8) since the initial release of Solaris.

Support for IPv6 was added in Solaris 8.

The echo service was enabled by default in releases up through Solaris 9, but has been disabled by default since the Solaris 10 3/05 release.