130Chapter 6: Metro Mobility: Client-Based Mobile IP
clients make to the host stack can be construed as security violations, causing some VPN clients
to prohibit the changes or tear down sessions. Specific client configuration is not included
because it varies from client to client.
Placement of the Home Agent for mobile roaming clients is important and critical to the proper
operation of the network. Figure 6-4 shows the two most common deployments. Option A is
viable for clients that always connect through the public network and do not require roaming
between the public and private networks. Option B shows how two Mobile IP sessions can be
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