Substring using cut/awk/sed Post: 302453025

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LEARN ABOUT NETBSD

ng_tee

NG_TEE(4)						   BSD Kernel Interfaces Manual 						 NG_TEE(4)

NAME

     ng_tee -- netgraph ``tee'' node type

SYNOPSIS

     #include <sys/types.h>
     #include <netgraph/ng_tee.h>

DESCRIPTION

     The tee node type has a purpose similar to the tee(1) command.  Tee nodes are useful for debugging or ``snooping'' on a connection between
     two netgraph nodes.  Tee nodes have four hooks, right, left, right2left, and left2right.  All data received on right is sent unmodified to
     both hooks left and right2left.  Similarly, all data received on left is sent unmodified to both right and left2right.

     Packets may also be received on right2left and left2right; if so, they are forwarded unchanged out hooks right and left, respectively.

HOOKS

     This node type supports the following hooks:

     right	   The connection to the node on the right.

     left	   The connection to the node on the left.

     right2left    Tap for right to left traffic.

     left2right    Tap for left to right traffic.

CONTROL MESSAGES

     This node type supports the generic control messages, plus the following.

     NGM_TEE_GET_STATS
	  Get statistics, returned as a struct ng_tee_stats.

     NGM_TEE_CLR_STATS
	  Clear statistics.

SHUTDOWN

     This node shuts down upon receipt of an NGM_SHUTDOWN control message, or when all hooks have been disconnected.  If both right and left hooks
     are present, node removes itself from the chain gently, connecting right and left together.

SEE ALSO

     tee(1), netgraph(4), ngctl(8)

HISTORY

     The ng_tee node type was implemented in FreeBSD 4.0.

AUTHORS

     Julian Elischer <julian@FreeBSD.org>

BSD
								   May 28, 2004 							       BSD

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