I believe that saying "ITRs don't receiving packets." is a linguistic
step that only confuses people. ITRs receive unencapsulated packets
from the site, and encapsulate them in LISP headers (assuming mappings
are already available.) Now, one can argue that the ITR function in the
router does not "receive" packets, since it was the router that received
the packet. (One can even argue that the router "intercepted" the
packet rather than "received" it.) But functionally it is the same thing.
Yours,
Joel
Dino Farinacci wrote:
Given that LISP ITRs work by intercepting packets that are not
addressed to them, a host implementation would need to be able to
intercept packets "in the stack". That is going to need some ability
to modify kernel behavior.
(1) ITRs don't receive packets. They encapsulate packets.
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