Hello,
I have a few trivial questions about GRE tunneling, more from an architectural point of view.
Say i have 2 sites: Site A and Site B
Site A ---- A Router ---Internet----- B Router ----- Site B
In this topology i have a single link between the 2 routers with 2 public ip's. I can make a tunnel interface with the source and destination of my physical interfaces. But i cannot make more GRE tunnel interfaces because the source and destination would then overlap right?
Site A ---- A Router ---Internet----- B Router ----- Site B
In another topology the Internet is an MPLS circuit provided by an ISP, so the transport is layer 2. In this scenario i could make multiple sub interfaces and have a tunnel with them to separate specific types of traffic? So if the interface to the MPLS would be Gi0/0, i can make Gi0/0.10 for with an ip on Site A and one on Site B. Here i can also create a tunnel interface and source/destination this tunnel with the ip addresses on the interfaces. Here i can make more tunnels to have more separation between traffic types because i can make another sub interface?
The end goal would be to have 2 sites and have separate parts of traffic going across a link between them, the traffic needs to be separated from each other, so on my routers i would need VRF support so i can segregate it completely.
