method
Click on the red underlined text to get to the source
... <--------------------------------------
Second method, using a tunnel within private realm:
==================================================
...
... Host-X. Traversal of end-to-
end packets within private realm may be illustrated as follows. In
the first method, outer layer of the outgoing packet from Host-A uses
...
... <-----------------------------------
Second method, using a tunnel within private realm:
==================================================
...