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.
This node type supports the following hooks: