Routing Notes 03 GRE and DMVPN 1

DMVPN CONFIGURATION

ROUTER 1

conf t
interface tunnel 0
tunnel source s0/0
tunnel mode gre multipoint
enabling DMVPN
tunnel key 1234
security feature
ip nhrp network-id 10
encryption
ip nhrp authentication kahitano
security feature
ip nhrp map multicast dynamic
dynamically resolve next hop, connect directly together all devices
address 192.168.0.1 255.255.255.0
address of router 1
tunnel path-mtu-discovery
how big a packet can be send, prevent from defragmentation
ip mtu 1400
mtu size
ip tcp adjust-mss 1360
tcp size
no split horizon
prevent split horizon to enable RIP
show ip interface brief

ROUTER 2

conf t
interface tunnel 0
tunnel source s0/1
tunnel mode gre multipoint
tunnel key 1234
ip nhrp network-id 10
ip nhrp authentication kahitano
ip nhrp map multicast dynamic
ip nhrp nhs 192.168.0.1
ip nhrp map 192.192.168.0.1 29.10.1.2
ip nhrp map multicast 29.10.1.2
address 192.168.2. 255.255.255.0
ip mtu 1400
ip tcp adjust-mss 1360

ROUTER 3

conf t
interface tunnel 0
tunnel source s0/1
tunnel mode gre multipoint
tunnel key 1234
ip nhrp network-id 10
ip nhrp authentication kahitano
ip nhrp map multicast dynamic
ip nhrp nhs 192.168.0.1
ip nhrp map 192.192.168.0.1 29.10.1.2   address of router 2
ip nhrp map multicast 29.10.1.2
address 192.168.3. 255.255.255.0
ip mtu 1400
ip tcp adjust-mss 1360

DMVP TESTING

ROUTER 2

show ip nhrp
ping 192.168.0.1
ping 192.168.0.3
show ip nhrp

ENABLING ROUTING PROTOCOL

ROUTER 3

show ip nhrp
router rip
version 2
no auto
network 192.168.0.0
network 29.0.0.0

ROUTER 2

router rip
version 2
network 192.168.0.0
network 29.0.0.0
no auto

ROUTER 1

router rip
version 2
network 192.168.0.0
network 29.0.0.0
no auto

ROUTER 2

show ip route  look for RIP route on tunnel 0