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Re: [RRG] Tunnel fragmentation/reassembly for RRG map-and-encaps architectures

I keep reading the debates about tunnel MTU, and wondering about two
practical observations.

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.)

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.

So while the theory clearly says that there is a problem with tunnel
mTU, the practice seems to suggest that it works.

Is there some other dimension here that explains the mismatch?

Thank you,
Joel M. Halpern


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