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spec: Mobile IP uses tunneling from the home agent to the mobile node 's care-of address , but rarely in the reverse direction . Science and Technology Program Researchers at the Bureau of Reclamation developed and built a wireless tunnel communication system that dramatically increases the safety of tunnel inspection and maintenance crews , reduces costs , and minimizes tunnel outage times . It provides tunnel mode semantics in the sense that the IP addresses seen by the applications and the IP addresses used on the wire are distinct from each other , providing the illusion that the application level IP addresses are tunneled over the network level IP addresses . As for the afterlife I know for a fact that my sister is makeing beautiful music with all of her heros . Little Agnes was , however , a remarkably steady and careful child , and all went well through the day , but towards night the mist settled down heavily upon the hills , and the heavy sighing in the air told that a storm was working up ; the children watched anxiously for their parents , but the fog cut off their view , flakes of snow began to fall , and darkness closed in early on them . Those moments were humorous to me . Loopback encapsulation takes place when a tunnel IPv6 entry-point node encapsulates tunnel IPv6 packets originated from itself , and destined to itself . The entry-point node of an " inner IPv6 tunnel " receives tunnel IPv6 packets encapsulated by the " outer IPv6 tunnel " entry-point node .