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 by
middleboxes. 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.
Tony
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