[Ndn-interest] NACK

Junxiao Shi shijunxiao at email.arizona.edu
Tue Jun 28 08:49:18 PDT 2016

Hi Tanusree

What’s the reason for “data packet is modified”?
For a transmission error due to line noise, the lower layer is responsible for detecting such error and drop the packet. NDNLPv2 will attempt to repair the packet loss by retransmitting the packet.
If there’s a malicious node on the path deliberately modifying the Data packet, NFD will not detect that because NFD neither has knowledge about the trust model, nor has the computation power to verify signatures. Consumer can re-express the Interest with an Exclude selector to exclude the bad Data, and hope the network can find a path to locate the good Data.

Yours, Junxiao

> On Jun 28, 2016, at 1:47 AM, Tanusree Chatterjee <tnsr.chatterjee at gmail.com> wrote:
> If a data packet is modified and detected during verification, can forwarder send a NACK. How the data can be resend in this case? If consumer is not satisfied it has to send the same interest again, is there any other way out to get the data which may not been correctly received due to some modification. 
> -- Regards,
> Tanusree Chatterjee

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