- When the mobile host
enters
a foreign
network:
- The mobile host must
acquires
a new IP address
(of the foreign network)
using the DHCP protocol
|
The mobile host
sends a
DHCP Discover request:
The mobile host
saves the
DHCP reply:
- The mobile host then
sends a
CareOf message
to
its home agent containing:
- The mobile host's
IP address
- The mobile host's
foreign IP address
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Example:
- When the home agent
receives
the
CareOf message:
- The home agent
creates an
IP tunnel to the
foreign agent
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The tunnel
is created
by adding the
following virtual entry
into its Forwarding table:
Destination | Next
----------------------------+------------------------
IP address of moble host | Foreign IP address
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Example:
Notice the
routing table entry
(10.0.0.4, 1, 12.0.0.99)
in the home agent
|