DMVPN

R1
interface Tunnel0
 ip address 192.168.0.1 255.255.255.0
 ip mtu 1400
 ip nhrp authentication cisco
 ip nhrp map multicast 203.0.0.2
 ip nhrp map 192.168.0.3 203.0.0.2
 ip nhrp network-id 100
 ip nhrp nhs 192.168.0.3
 ip tcp adjust-mss 1360
 ip ospf network broadcast
 ip ospf priority 0
 tunnel source Serial2/0
 tunnel mode gre multipoint

router ospf 1
 network 1.1.1.0 0.0.0.255 area 0
 network 192.168.0.0 0.0.0.255 area 0


R3
interface Tunnel0
 ip address 192.168.0.3 255.255.255.0
 no ip redirects
 ip mtu 1400
 ip nhrp authentication cisco
 ip nhrp map multicast dynamic
 ip nhrp network-id 100
 ip tcp adjust-mss 1360
 ip ospf network broadcast
 ip ospf priority 5
 tunnel source Serial2/0
 tunnel mode gre multipoint

end

router ospf 1

 network 3.3.3.0 0.0.0.255 area 0

 network 192.168.0.0 0.0.0.255 area 0

R1#show ip nhrp  
192.168.0.1/32 via 192.168.0.1
   Tunnel0 created 00:00:38, expire 01:59:21
   Type: dynamic, Flags: router unique local
   NBMA address: 201.0.0.1
    (no-socket)
192.168.0.2/32 via 192.168.0.2
   Tunnel0 created 00:00:38, expire 01:59:21
   Type: dynamic, Flags: router used nhop
   NBMA address: 202.0.0.2
192.168.0.3/32 via 192.168.0.3
   Tunnel0 created 00:14:58, never expire
   Type: static, Flags: used
   NBMA address: 203.0.0.2

R1#show ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override

Gateway of last resort is 201.0.0.2 to network 0.0.0.0

S*    0.0.0.0/0 [1/0] via 201.0.0.2
      1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        1.1.1.0/24 is directly connected, Loopback0
L        1.1.1.1/32 is directly connected, Loopback0
      2.0.0.0/32 is subnetted, 1 subnets
O        2.2.2.2 [110/1001] via 192.168.0.2, 00:15:02, Tunnel0
      3.0.0.0/32 is subnetted, 1 subnets
O        3.3.3.3 [110/1001] via 192.168.0.3, 00:15:12, Tunnel0
      192.168.0.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.0.0/24 is directly connected, Tunnel0
L        192.168.0.1/32 is directly connected, Tunnel0
      201.0.0.0/24 is variably subnetted, 2 subnets, 2 masks
C        201.0.0.0/30 is directly connected, Serial2/0
L        201.0.0.1/32 is directly connected, Serial2/0