my question is that i am going to setup GRE/IPSEC between the 2 routers , but the 2 loopback interfaces of the lt2pv3 tunnel will be routable through the GRE/IPsec tunnel , is this optimum solution & will it work , or there is a nother solution to secure the l2tp " l2tp/ipsec)
There will not be any issue in configuring the loopback interfaces with GRE/IPSEC configuration. You can use the physical interface (or the loopback interface) IP addresses to identify Internet Key Exchange (IKE) peers.
The below URL illustrates an IP Security (IPSec) configuration using a generic routing encapsulation (GRE) tunnel between two routers. IPSec can be used to encrypt GRE tunnels to provide network layer security for non-IP traffic, such as Novell Internetwork Packet Exchange (IPX), AppleTalk, and so forth. The GRE tunnel in this example is purely used for transporting non-IP traffic. Hence, the tunnel does not have any IP address configured. Here are some configuration considerations:
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