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Hub and spoke topology

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  • Hub and spoke topology

    I need an advice : I need to change the current VPN configuration with a new one. The topology is : 1 central location and 11 branches. For central office I've choose Cisco ASA 5510. The problem is the remote routers. My needs for those are : WAN connections : 1 x FastEthernet and one port for connecting an 3G modem which has and USB connector (if its possible or I will try to find an 3G modem with Ethernet connector) and 1 x Ethernet LAN connector. Another question is what VPN to choose (PPTP, L2TP etc). I'm thinking to use the 3G connection only as a fail-over solution not for daily usage; in this case do I need a routing protocol?
    Thanks for your help