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GetVPN design question

Attached here the diagram for the Key server and it's group member. Below are the question. 

1. The design for just one cisco router as a key server, it consume a lot of processing and memory of the router. Let’s say added two router with the same model It will take the burdened on just one router of the GETVPN design.

2. For the link connection bandwidth, if the customer decide to apply to 256Kbps, what will be the link utilization of one group member connect to key server? If there are 700 hundred remote site, how big the bandwidth should the customer apply for?

3. Does GetVPN can communicate to key server or to another group member if the branches 3G router is using dynamic IP?

appreciate for helping to identify constraint on the diagram attached!

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