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Comments
GRE runs in top of IPv4.
It uses neither TCP nor UDP.
Therefore, you should forward IP proto 47.
http://www.networksorcery.com/enp/protocol/gre.htm
If you have OpenWrt, simply type "47" into the protocol selection box, and the system will recognize GRE.
Thanks you. No wonder why I can't find GRE in OpenWRT's port forwarding. I guess you need to enter the number 47.
Yes @yoursunny is correct. GRE is ip proto 47.
Most commercial retail routers don't have the option, but DMZ often forwards all protocols (depends how it's implemented).
You could always try and using PFSense as your router. Has full support for GRE built in.