Introduction
Spectrum24 AP-4111 DS Access Point Product Reference Guide
21
Mobile IP is like giving an individual a local post office forwarding address
when leaving home for an extended period. When mail arrives for the
individual home address, it is forwarded by the local post office to the current
care-of-address. Using this method, only the local post office requires
notification of the individual current address. While this example represents
the general concept of Mobile IP operation and functionality, it does not
represent the implementation of Mobile IP used.
A tunnel is the path taken by the original packet encapsulated within the
payload portion of a second packet to some destination on the network.
A
Home Agent
is an AP acting as a router on the MU home network.
The home agent intercepts packets sent to the MU home address and tunnels
the message to the MU at its current location. This happens as long as
the MU keeps its home agent informed of its current location on some
foreign link.
A
Foreign Agent
is an AP acting as a router at the MU location on a foreign
link. The foreign agent serves as the default router for packets sent out by the
MU connected on the same foreign link.
A care-of-address is the IP address used by the MU visiting a foreign link.
This address changes each time the MU moves to another foreign link. It can
also be viewed as an exit point of a tunnel between the MU home agent and
the MU itself.
The
S24 Mobile IP (roaming across routers)
feature enables an MU
on the Internet to move from one subnet to another while keeping its
IP address unchanged.
To configure this feature, see
2.4 Configuring System Parameters
The scanning and association process continues for active MUs.
This allows the MUs to find new APs and discard out-of-range or
deactivated APs. By testing the airwaves, the MUs can choose the best
network connection available.
Summary of Contents for AP-4111 DS
Page 112: ...Monitoring Statistics 104 Spectrum24 AP 4111 DS Access Point Product Reference Guide ...
Page 120: ...Hardware Installation 112 Spectrum24 AP 4111 DS Access Point Product Reference Guide ...
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Page 126: ...B 2 Spectrum24 Access Point AP 3020 Product Reference Guide ...