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site vpn with dynamic ip

i hav 2 cisco 877 routers with dynamic ips provided from my isp .i hav created site to site vpn among them with the dynamic ip address but whenever the ip changes i hav to change the shared key's ip address and the tunnel ip address after which it gets connected again. this is my problem due to which i applied for dyndns. after i enter the hostname instead of the ip address, it connects for the first time but when the ip changes again, i hav to enter the ip address the second time. so is there anyway the hostname remains in the router instead of the ip and still it is able to resolve because i tried turning off the lookup but thn the router does not even resolves the hostname.

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Re: site vpn with dynamic ip

No, cisco routers identify the tunnel endpoints using IP address and not the device name. However in your case a Dynamic Multipoint VPN (DMVPN) may help, check this link.

http://www.cisco.com/en/US/tech/tk583/tk372/technologies_configuration_example09186a008014bcd7.shtml

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