[Nfd-dev] A question about data return pathways

[Junxiao Shi]

Hi Anthony

what happens to the PIT entry when a data packet comes back to NFD through
the same face that the interest came through?

The Data packet would satisfy the PIT entry. A node does not care whether
an a Interest was forwarded out of the face receiving Data.
Cough cough: you can use this property to for cache poisoning, by sending
an Interest followed by a Data satisfying that Interest. In reality it
works if you timed your packets right.

I have a configuration where there are two unicast UDP faces, and an
interest comes from one of them (face A) and then gets relayed to the other
face (face B). If data for that interest is returned to NFD through face A,
what happens to it?

The Data satisfies the PIT entry. The node does not forward it out of face
A, because there is only one neighbor node on this face, and the Data comes
from that neighbor.

Would there be a way to have the data be routed to face B for delivery to
other devices, rather than simply disappearing?

Yes, the node connected to face B needs to express an Interest.

Yours, Junxiao
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