I have 2 Cisco 8xx routers, both with an ethernet (internal) and ADSL (external) interfaces. The IP address given to the ADSL interface is dynamic, negotiated via PPP to a dialer interface, a configuration from a typical ISP. Both external dynamic IP addresses are known with a fully qualified domain name via dynamic DNS that I set up already.
Now I would like to set up a VPN between these 2 routers to connect the 2 internal networks together: I set up the VPN using their IP addresses (crypto policy, crypto transform-set, crypto map) and it works like a charm until I reboot the router and the IP address will change. I need to solve this using the dynamic DNS names instead, but all my attempts to set up the configuration using the dynamic DNS names failed so far ... :-(
Can you please suggest a configuration sample or a document showing how to configure the VPN using the dynamic DNS names as VPN peers?
Thank you in advance! Best regards. Diego.