The only realy advantage of using an encrypted GRE tunnel, over a normal IPSec tunnel, is that GRE tunnelws would be able to pass no ip traffic. You would use encrypted GRE if you had to pass non-routeable traffic between the two site (eg Netbios,etc, but also Routing updates). I have use encrypte GRE tunnels in the past, to allow EIGRP to pass over the tunnel. EIGRP updates wont pass over an IPSec tunnel (as it ia m/cast).
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