I am slightly confused about your situation. You describe the traffic from one interface to the other as going through a firewall and then you seem to describe tham as being on the same /30 subnet. How can they be in the same subnet and be going through a firewall?
You will probably need some access rule in the firewall. You could either just permit traffic from 1 IP to the other, or you could permit GRE which is IP protocol 47.
Perhaps you can clarify your topology and environment so that we can help give you better answers.
I have looked at the diagram that you posted and it clarifies parts of what we need to know but leaves some questions. I see that the diagram shows the loopback addresses as /32 host addresses and this can be just fine. But the drawing shows the tunnel destination as the remote loopback with a /30 mask. I still do not understand that inconsistency. If the local router believes that the tunnel destination is is a subnet that is connected on the loopback interface then the packets for the GRE tunnel will never be transmitted outside of the router.
Perhaps you can clarify the addressing issue? It would also help if you could post the output of show ip route from both of the routers.
I am glad that you now have the tunnel working. Sometimes removing and re-configuring is a good approach to resolve issues where something is not working. It sometimes helps you to rethink what you are trying to accomplish.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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