Hi, I would like to know the significance of the IP address used in the GRE tunnel configuration. I thought that tunnel source XXX & tunnel destination XXXX are all that is required to get a tunnel to work. However, I did use IP address on both ends of the tunnel and kept it in the same subnet.
Now, the issue is,
In one setup, I changed the IP addresses to be of different subnet at the two ends of the tunnel for eg, at end A I would give 10.10.10.1 & at end B I would give 192.168.10.1. It didnt work.
However, in my live network where everything (connected & static) are reditributed into ospf the same setup worked!
which begs the question, what is the role of the IP address assigned to the tunnel?