Topology
Summary:
To implement Flex VPN or IPSEC VPN the topology shown above. The motive is to make the reachability between LAN to LAN network i.e from 20.20.20.0 to 30.30.30.0 & vice versa.
Currently we have configure simple connectivity in which R1 and R2 is reachable to each other via internet cloud.
The basic requirement of any VPN is the rechability between source and destination end point of tunnel.