we want to establish ipsec tunnels between vpn clients and central internet router (7xxx). Is it possible to use a loopback interface with private ip address as the tunnel endpoint (where we set the 'crypto map' reference)?
Remember the 1720 is goin to encrypt interesting traffic that matches you access list if the traffic doesnt attempt to move through loopback 0 then your traffic won't be encrypted. Think of the 1720 as a pix you have an untrusted interface and the traffic leaving that interface must be encrypted from prying eyes to your peer.
I think this could not be done. How do your client find the tunnel end point (lookback with private IP address) from internet? If you have public IP address assgined to the loopback interface, it should be ok.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...