Tunnel GRE sobre IPsec

R1#

###### configuracion GRE ######
interface Tunnel0
 ip address 172.16.0.1 255.255.255.0
 tunnel source 10.10.10.1
 tunnel destination 10.10.10.6
end

router ospf 1
 network 172.16.0.0 0.0.0.255 area 0
 network 192.168.10.0 0.0.0.255 area 0

access-list 101 permit ip 192.168.10.0 0.0.0.255 192.168.20.0 0.0.0.255

####### config IPsec ############

access-list 101 permit gre any any

crypto isakmp policy 10
 encr aes
 authentication pre-share
 group 2

crypto isakmp key 6 cisco address 10.10.10.6
crypto ipsec transform-set TSET ah-sha-hmac esp-aes
crypto map POLITICA 10 ipsec-isakmp
 set peer 10.10.10.6
 set transform-set TSET
 match address 101

 int s0/0 crypto map POLITICA