Erm, nevermind. My lack of connectivity was due to a routing protocol issue. 
The scenario below seems to work (at least in GNS3)

On May 14, 2014, at 9:16 PM, Hughes, Scott GRE-MG <[email protected]> wrote:

> Hello,
> 
> I have a router terminating two tunnels, one is a regular IPsec tunnel, and 
> one is a GRE tunnel with IPsec protection. Both tunnels work by themselves, 
> but they cannot communicate with each other.
> 
> I remember reading somewhere that you cannot hairpin an IPsec tunnel to a 
> DMVPN tunnel, and it would appear that applies to a regular GRE tunnel as 
> well.
> 
> Both tunnels have peer/endpoint addresses on one VRF, with payload traffic on 
> another.
> 
> Can anyone tell me if this limitation is documented anywhere, and if there's 
> a workaround, other than to terminate the tunnels on 2 separate routers?
> 
> Platform ISR G2, IOS 15.1(4)M8
> 
> Thanks,
> Scott
> 
> 
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