Firstly, while there are many concerns about the way Mobile-IP works,folks don't complain about applications not working over MIP, even MIPv4(which requires tunnels.)
Can I ask, how broadly are people using MIP? I don't know of anyone using it today.
Secondly, there are a lot of VPNs. Many of them provided bymiddleboxes. They seem to use tunnels exactly the way the proposals on the table do. And they seem to work. With a wide range of applications.Is there some other dimension here that explains the mismatch?
How many of those VPNs are based on MPLS?I think I can tell you without violating too many corporate secrets that anytime Cisco sees a customer deploying an L3 tunneling solution that the MTU is an issue, usually resolved by a manual workaround.
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