crypto isakmp policy 10
 encr aes 256
 hash sha
 authentication pre-share
 group 2
crypto isakmp key <tunnel key> address 0.0.0.0 0.0.0.0
crypto ipsec transform-set strong esp-aes esp-sha-hmac
crypto ipsec profile DMVPN
 set security-association lifetime seconds 120
 set transform-set strong 

interface Tunnel0
 ip address <tunnel private IP> 255.255.255.0
 no ip redirects
 ip mtu 1440
 ip nhrp authentication <NHRP key>
 ip nhrp map multicast dynamic
 ip nhrp map <hub router tunnel private IP> <hub router public IP>
 ip nhrp map multicast <hub router public IP>
 ip nhrp network-id 1
 ip nhrp nhs <hub router tunnel private IP>
 tunnel source <whatever interface the internet is hooked to>
 tunnel mode gre multipoint
 tunnel key 0
 tunnel protection ipsec profile DMVPN

router eigrp 90
 network <tunnel IP network> 0.0.0.255
 network <local network> 0.0.0.255
 passive-interface <Whatever your ethernet interface is>
 no auto-summary