Joel> Given that LISP ITRs work by intercepting packets that are
Joel> not addressed to them, a host implementation would need to
Joel> be able to intercept packets "in the stack". That is going
Joel> to need some ability to modify kernel behavior.
I'm trying to figure out how an ITR does anything different than a
router with a tunneled interface.
Every host I'm aware of has a facility for setting up an interface
that routes some set of packets--including potentially the default
route--through a tunnel interface that then passes the packet to
userspace for processing.
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