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NAT-T configuration on ISR 2811 router

Hi,

We have site to site IPSec VPN setup. We have ASA 5510 at our head office and cisco 2811 router in branches. Branch routers has ADSL connection and router is getting public IP directly from ISP. But now our ISP is going to provide connection over fibre and branch cisco 2811 router will not get public IP. Fiber device (ONT) will get public IP address. In this case how can I make VPN connectivity to Head office. I search on the net and found that NAT-T can do this but did not find proper information.

 

Can someone please help me?

 

Regards

Mukesh Patel.

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