[ndnSIM] dealing with duplicated Interests for data provider

[yao hu]

Hi Alex,

For intermediate routers, they drop the subsequent Interests (with the same
nonce) from the same requester to avoid the loop Interest path. But if the
data provider receives two identical Interests (with the same nonce) from
two different faces, it will still drop the subsequent incoming Interest?
How about replying the Data both on these two faces? Because I think this
is still meaningful to ensure the data retrieval.

Thanks for your reply~

Regards,
huyao
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