Configuration Details
A DMVPN Spoke is configured with one or more hub IP addresses. DMVPN hub IP addresses are typically static, such as at a corporate headquarters. DMVPN spoke IP addresses may be static, or dynamic. For example a DMVPN spoke router can be configured as a DHCP client on a DSL, cable provider's network or even be behind a NAT (Network Address Translation) Gateway. The spoke router is configured with the hub's IP address, allowing it to establish a tunnel with the hub router.
A key feature of DMVPN is that the hub router only needs a single tunnel interface to be configured, and does not need separate configuration sections for each of the spoke routers. This allows spoke VPN routers to be deployed without the need to configure additional peers on the hub(s). It also significantly reduces the amount of configuration required on the hub router.
Read more about this topic: Dynamic Multipoint Virtual Private Network
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