GRE tunnel tool

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I am trying to use CORE in a distributed environment. I am trying to simulate a 
host in one machine and another host in another machine. I tried with the GUI 
assigning a node to another machine (Emulation servers) and worked well. 
However, I am trying now to use the tunnel tool but this does not work and I do 
not know why.

What steps will reproduce the problem?
1. Host creation -> ip set to 10.0.0.1
2. Tunnel tool creation -> IP set (Remote machine IP): 173.155.13.1
3. Link between host creation and tunnel creation

The same in the remote site:
1. Host creation -> ip set to 10.0.0.2
2. Tunnel tool creation ->  IP set to (Remote machine): 173.155.13.2
3. Link between host creation and tunnel creation

What is the expected output? What do you see instead?
I connect to host machine (10.0.0.1) and ping to 10.0.0.2. Expected to see 
response from 10.0.0.2

What version of the product are you using? On what operating system?
Version of core 4.7. Ubuntu 14.04.2 LTS. 

Please provide any additional information below.

I understood that the Tunnel tool creates GRE tunnel automatically, so I did 
not configure anything more. Maybe I am wrong or doing something wrong?

Thank you and best regards,

John

Original issue reported on code.google.com by [email protected] on 6 Jul 2015 at 5:10