A modem? Like an asynchronous modem? Why would you want to encrypt over a modem connection?
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yes I want between the two routers do but encrypt the router with cable modem / router with 1 public ip address how can I configure
You do get a public IP address on one of the boxes right? Or both routers are behind a NAT box?
If there is a NAT box then you need to configure a static NAT [ on that device] for udp 500 and udp 4500 towards the router.
When it's done then you can configure a tunnel protection tunnel interface
Well to build a VPN between both sides, then you need at minimum a site either without NAT/PAT or with Static NAT [ udp 500 and 4500]
If both are behind pat, then you can't build a vpn since the udp traffic will be dropped without any xlate....
R1 is private ip address 192.168.0.121 and R2 is private ip address 192.168.0.122 percies what should I configure the routers?
U did not answer my initial question. Are theses 2 devices behind the SAME Cable Modem or behind DIFFERENT Cable Modem?
Let me know....