There is even a standard for IP in IP encapsulation. What is the use case here? I can understand stuff like TCP over DNS, where IP might be unavailable, but if you can do IP in IP, couldn’t you simply do regular IP?
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There is even a standard for IP in IP encapsulation. What is the use case here? I can understand stuff like TCP over DNS, where IP might be unavailable, but if you can do IP in IP, couldn’t you simply do regular IP?
Obvious example: Your gateway drops packets to host A, but you can send packets to host B, and host B cand send to host A. So you tunnel to B which then forwards to A. IP in IP simply allows you to tunnel in an application-independent manner, unlike application level proxies, and you preserve TTL.