I have one HQ router connected to 4 remote locations. I would like to establish the GRE tunnels from remote offices to HQ. SO, how do I do that? GRE tunneling is only for point-to-point right?
You could setup a tunnel to HQ for every remote location and if you use a proper routing scheme you would even be able to establish any-any connectivity.
It is perfectly possible to terminate all tunnel at HQ to the same ip address. Please read the following document on using GRE tunnels. It is the Cisco configuration guide but the subject is explained in more detail than usual.
