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    Command:

    ng_tee

    
         #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 net-
         graph 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 unmod-
         ified 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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