- Recall on how
a router can
determine that
it need to
perform
de-encapsulation:
- When the destination router M
receives the
encapsulated IP packet,
M
detects that the
IP packet contains
its own address M:
- When the destination router M
receives the
encapsulated IP packet,
M
detects that the
IP packet contains
its own address M:
- The
IP forwarding algorithm
with support
for
tunneling:
- Suppose the
encapsulated
IP packet is
received:
- The encapsulated IP packet is
processed as follows:
- The router detects that
the
(outer) IP packet has
its own IP address:
- The router will
de-encapsulate (extract) the
inner IP packet:
- The inner IP packet is
then forwarded/routed:
- The router detects that
the
(outer) IP packet has
its own IP address: