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.\" Author: Archie Cobbs <archie@FreeBSD.org>
.\" $Whistle: ng_echo.8,v 1.4 1999/01/25 23:46:26 archie Exp $
.\"
.Dd January 19, 1999
.Dt NG_ECHO 4
.Os
.Sh NAME
.Nm ng_echo
.Nd netgraph echo node type
.Sh SYNOPSIS
.In netgraph/ng_echo.h
.Sh DESCRIPTION
The
.Nm echo
node type reflects all data and control messages back to the sender.
This node type is used for testing and debugging.
.Sh HOOKS
A
.Nm echo
node accepts any request to connect, regardless of the hook name,
as long as the name is unique.
.Sh CONTROL MESSAGES
This node type supports only the generic control messages.
Any other control messages are reflected back to the sender.
.Sh SHUTDOWN
This node shuts down upon receipt of a
.Dv NGM_SHUTDOWN
control message, or when all hooks have been disconnected.
.Sh SEE ALSO
.Xr netgraph 4 ,
.Xr ng_hole 4 ,
.Xr ngctl 8
.Sh HISTORY
The
.Nm
node type was implemented in
.Fx 4.0 .
.Sh AUTHORS
.An Julian Elischer Aq Mt julian@FreeBSD.org