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<p>Giuseppe,</p>
<p>The reliability system doesn't use NACKs, but rather acknowledges
received packets with a positive acknowledgement and considers a
packet lost (and needing to be retransmitted) if the sender does
not receive an Ack for a packet. It can also detect gaps in
acknowledged sequence numbers and uses these to trigger a
retransmission.</p>
<p>Also, the reliability system takes place at the level of an
individual connection from one host to the next (the NDN link
layer, or NDNLPv2) and not on the span from a consumer to a
producer. Therefore, retransmissions will not take place when the
consumer receives a notification like "OnInterestUnsatisfied", as
this occurs above the link layer. I believe you may be looking at
the NACK documentation, which I believe states that the consumer
application has the option to retransmit an Interest when it is
NACK'd. The documentation for NDNLPv2, including the reliability
system can be found here:
<a class="moz-txt-link-freetext" href="https://redmine.named-data.net/projects/nfd/wiki/NDNLPv2">https://redmine.named-data.net/projects/nfd/wiki/NDNLPv2</a><br>
</p>
<p>Eric<br>
</p>
<br>
<div class="moz-cite-prefix">On 01/04/2018 06:59 AM, Giuseppe
Carella wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAA0Wn-kXVg2xGg+5+y3h2LewLqOV20O9nOEX3PFfokKAQky0XQ@mail.gmail.com">
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<div>Good morning community,<br>
<br>
</div>
I was checking some information about the last NFD
release. <br>
</div>
<div>It seems possible to set some useful options like the
retransmission with UDP. <br>
</div>
</div>
<br>
</div>
<div>In the documentation it's written that the retransmission
takes place when the consumer receives NACK. </div>
<div><br>
</div>
<div>Is the retransmission possible when the NFD consumer
receives the message "OnInterestUnsatisfied"? </div>
<div><br>
</div>
<div>Thank you.</div>
<div>Giuseppe.<br>
</div>
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