132Chapter 6: Metro Mobility: Client-Based Mobile IP
over Mobile IP, and encapsulation is always removed in the order opposite to the order in which
it was added. A single device can perform both Mobile IP and IPSec functions. However, you
must make sure that the device is performing the encapsulation in the expected order. You must
also ensure that the MTU setting on the Mobile Nodes supports both the overhead from Mobile
IP and IPSec.
Both Mobile IP over IPSec and IPSec over Mobile IP have advantages and disadvantages.
Running IPSec over Mobile IP allows the user to roam without needing to reestablish the VPN
after each access link change. ...
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