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Re: shim - transport/app communication
Shim-aware transports/applications could also emit periodic keepalives
when they're otherwise idle so the shim knows it shouldn't remove state
yet. (In fact many applications and/or TCP already do so.)
That is typically done as a hack to keep NAT-boxen from ditching you
right? Some applications do that, others simply break.
I believe that keeping applications shim-unaware is a worthy goal.