DMVPN configuration: Should a firewall be between router and Internet?

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Cisco's Dynamic Multipoint VPN (DMVPN) product allows you to easily configure site-to-site VPNs across WAN connections. In the scenario you describe, where the routers are only serving as DMVPN endpoints and are locked down to that traffic profile, you probably don't need to bother with an additional firewall between the router and the Internet. If you placed a firewall in front of the device, it would provide you with an additional layer of filtering, but these restrictions would duplicate those already in place on the router. The only advantage of such a device would be the limitation of source addresses that may initiate a VPN connection to your router. This is something that can be configured through the router's security policy instead. I would suggest that you use a port scanner like Nmap to verify that your router configuration properly limits external access.

You may wish to consider placing a firewall between the router and the internal network, depending upon the degree of trust you place in the remote endpoints. This configuration would allow for VPN traffic inspection after the data is decrypted by the router and before it enters your internal network. Additionally, it would provide you with granular control over the destinations and services reachable through the VPN.

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