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<div class="">Junxiao,</div>
<br class="">
<div>
<blockquote type="cite" class="">
<div class="">On Jul 12, 2016, at 12:58 PM, Junxiao Shi <<a href="mailto:shijunxiao@email.arizona.edu" class="">shijunxiao@email.arizona.edu</a>> wrote:</div>
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<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
Hi Lan</div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<o:p class=""> </o:p></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
Look at this topology:</div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-family: 'Courier New';" class="">A---B<o:p class=""></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-family: 'Courier New';" class="">\ /<o:p class=""></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-family: 'Courier New';" class=""> C<o:p class=""></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
Assume every link has the same delay, and the processing delay at each node is zero.</div>
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<o:p class=""> </o:p></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
When C sends the same Interest to both A and B, A and B would forward the Interest to each other, and get Nack-Duplicate from each other.</div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
Per ChronoSync protocol, the applications on A and B should express Interests with the same name. Since A and B are symmetric, let’s look at A.</div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
There could be three different timings:</div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<o:p class=""> </o:p></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<b class="">TIMING0</b><span class="Apple-converted-space"> </span>AppA expresses the Interest before C’s Interest arrives at A.<b class=""><o:p class=""></o:p></b></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
If we relabel A->C B->A C->B, it becomes either TIMING1 or TIMING2.</div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<o:p class=""> </o:p></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<b class="">TIMING1</b><span class="Apple-converted-space"> </span>AppA expresses the Interest after C’s Interest has been forwarded to B, but before B responds Nack-Duplicate.<b class=""><o:p class=""></o:p></b></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
The duration between A forwarding C’s Interest to B and A receiving Nack-Duplicate from B is most likely shorter than the suppression interval, so appA’s Interest would be suppressed.</div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<font color="#ff2600" class="">When Nack-Duplicate against C’s Interest arrives from B, strategy at A should send appA’s Interest to B.</font></div>
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<o:p class=""> </o:p></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<b class="">TIMING2</b><span class="Apple-converted-space"> </span>AppA expresses the Interest after B responds Nack-Duplicate.<b class=""><o:p class=""></o:p></b></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
When Nack-Duplicate against C’s Interest arrives from B, strategy at A should not return the Nack to C, because appA is another upstream which has not Nacked.</div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<font color="#ff2600" class="">When appA expresses the Interest, strategy at A should not suppress this Interest, because the sole pending upstream (appA) is now a downstream. The strategy should forward the Interest to both B and C.</font></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<o:p class=""> </o:p></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<o:p class=""> </o:p></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
When the strategy behaves as what I describe above, everyone should be getting Data.</div>
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</blockquote>
<div><br class="">
</div>
Question is whether the multicast strategy ChronoSync uses has the above behavior or not (e.g., "<font color="#ff2600" face="Calibri, sans-serif" size="4" class="">When Nack-Duplicate against C’s Interest arrives from B, strategy at A should send appA’s Interest
to B.</font><font color="#ff2600" face="Calibri, sans-serif" class=""><span style="font-size: 15px;" class="">”</span></font><font color="#ff2600" face="Calibri, sans-serif" size="4" class="">)</font><font face="Calibri, sans-serif" size="4" class="">. I
doubt it is the case based on the following.</font></div>
<div><font face="Calibri, sans-serif" size="4" class=""><br class="">
</font></div>
<div><font face="Calibri, sans-serif" size="4" class="">Below is from your earlier email:</font></div>
<div><br class="">
</div>
<div>============== below is from Junxiao’s email ========</div>
<div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
From A’s point of view, face261 is the local app, face262 is B, face263 is C.</div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
Incoming+outgoing Interests, and PIT entry contents are as follows:</div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<o:p class=""> </o:p></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-family: 'Courier New';" class="">52.39 from=C=4168 to=app<o:p class=""></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-family: 'Courier New';" class=""> PIT in=[C=4168@52.39] out=[app@52.39]<o:p class=""></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-family: 'Courier New';" class="">52.72 from=B=6605<o:p class=""></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-family: 'Courier New';" class=""> PIT in=[C=4168@52.39,B=6605@52.72] out=[app@52.39]<o:p class=""></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-family: 'Courier New';" class="">52.74 from=app=7385 to=B,C<o:p class=""></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-family: 'Courier New';" class=""> PIT in=[C=4168@52.39,B=6605@52.72,app=7385@52.74] out=[app@52.39,B@52.74,C@52.74]<o:p class=""></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-family: 'Courier New';" class="">56.39 PIT in=[B=6605@52.72,app=7385@52.74]+expired[C=4168@52.39] out=[B@52.74,C@52.74]+expired[app@52.39]<o:p class=""></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-family: 'Courier New';" class="">56.72 PIT in=[app=7385@52.74]+expired[C=4168@52.39,B=6605@52.72] out=[B@52.74,C@52.74]+expired[app@52.39]<o:p class=""></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-family: 'Courier New';" class="">56.74 Interest unsatisfied, PIT erased<o:p class=""></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-family: 'Courier New';" class=""> </span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-family: 'Courier New';" class="">56.89 from=C=0641 to=app<o:p class=""></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-family: 'Courier New';" class=""> PIT in=[C=0641@56.89] out=[app@56.89]<o:p class=""></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-family: 'Courier New';" class="">56.90 from=app=7567 to=B,C<o:p class=""></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-family: 'Courier New';" class=""> PIT in=[C=0641@56.89,app=7567@56.90] out=[app@56.89,B@56.90,C@56.90]<o:p class=""></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-family: 'Courier New';" class="">57.06 from=B=1547<o:p class=""></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-family: 'Courier New';" class=""> PIT in=[C=0641@56.89,app=7567@56.90,B=1547@57.06] out=[app@56.89,B@56.90,C@56.90]<o:p class=""></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-family: 'Courier New';" class="">60.89 PIT in=[app=7567@56.90,B=1547@57.06]+expired[C=0641@56.89] out=[B@56.90,C@56.90]+expired[app@56.89]<o:p class=""></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-family: 'Courier New';" class="">60.90 PIT in=[B=1547@57.06]+expired[C=0641@56.89,app=7567@56.90] out=[]+expired[app@56.89,B@56.90,C@56.90]<o:p class=""></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-family: 'Courier New';" class=""> </span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-family: 'Courier New';" class="">61.05 from=C=6600 to=app,B,C<o:p class=""></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<span style="font-family: 'Courier New';" class=""> PIT in=[B=1547@57.06,C=6600@61.05]+expired[app=7567@56.90] out=[app@61.05,B@61.05,C@61.05]<o:p class=""></o:p></span></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<o:p class=""> </o:p></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
Time is represented with last two digits of integral part and first two digits of fractional part. Nonce is represented with last four digits. PIT in-record is represented as <downstream>=<nonce>@<time>. PIT out-record is represented as <upstream>@<time>.</div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<o:p class=""> </o:p></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
The PIT entry has been erased at 56.74, so anything before that does not affect the later part.</div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<o:p class=""> </o:p></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
At 61.05, an Interest with nonce 6600 is received from C. Before processing this Interest, the PIT entry has one unexpired in-record from B which has nonce 1547 and was created at 57.06; all out-records have been expired.</div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
This Interest is forwarded with nonce 6600 to both app and B.</div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
Since the PIT entry indicates B still wants the Data, the strategy also forwards the Interest with nonce 1547 (which came from B at 57.06) back to C. </div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<o:p class=""> </o:p></div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
While this may not be the best idea for multicast strategy, and using a nonce from non-local-app may be problematic with /localhop, this forwarding is valid in general: nonce 1547 has never been forwarded earlier, and downstream B still wants the Data, so the
strategy can certainly forward the Interest to C using this nonce.</div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
============ above is from Junxiao’s email =========</div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<br class="">
</div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
The above trace did not include some important information, i.e. (1) the NACK-duplicate messages and (2) what happens after receiving the NACKs. So I searched a’s nfd log from Ashlesh’s email and found the following which I hope are the relevant messages.</div>
<div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">
<br class="">
</div>
<div style="margin: 0in 0in 0.0001pt;" class=""><font face="Calibri, sans-serif" class=""><span style="font-size: 15px;" class="">1467225861.054557 DEBUG: [Forwarder] onIncomingInterest face=263 interest=/localhop/NLSR/sync/e4c858598a526f7f25d42f4da49cb51b7950cf352e26d5092bd35126b509101b
(A received sync interest from C with nonce 6600 — the nonce is inferred from your email, I didn’t check the ndndump log)</span></font></div>
<div style="margin: 0in 0in 0.0001pt;" class=""><font face="Calibri, sans-serif" class=""><span style="font-size: 15px;" class=""><br class="">
</span></font></div>
<div style="margin: 0in 0in 0.0001pt;" class=""><font face="Calibri, sans-serif" class="">
<div style="margin: 0in 0in 0.0001pt;" class=""><span style="font-size: 15px;" class="">1467225861.054705 DEBUG: [Forwarder] onOutgoingInterest face=262 interest=/localhop/NLSR/sync/e4c858598a526f7f25d42f4da49cb51b7950cf352e26d5092bd35126b509101b </span></div>
<div style="font-size: 15px;" class=""> (A sent sync interest to B with the nonce 6600 - again nonce value is inferred from your email)</div>
</font></div>
<div style="margin: 0in 0in 0.0001pt;" class=""><font face="Calibri, sans-serif" class=""><span style="font-size: 15px;" class=""><br class="">
</span></font></div>
<div style="margin: 0in 0in 0.0001pt;" class=""><font face="Calibri, sans-serif" class=""><span style="font-size: 15px;" class="">1467225861.054736 DEBUG: [Forwarder] onOutgoingInterest face=263 interest=/localhop/NLSR/sync/e4c858598a526f7f25d42f4da49cb51b7950cf352e26d5092bd35126b509101b</span></font></div>
<div style="margin: 0in 0in 0.0001pt;" class=""><font face="Calibri, sans-serif" class=""><span style="font-size: 15px;" class=""> (A sent sync interest to C with the nonce 1547 - again nonce value is inferred from your email) </span></font></div>
<div style="margin: 0in 0in 0.0001pt;" class=""><font face="Calibri, sans-serif" class=""><span style="font-size: 15px;" class=""><br class="">
</span></font></div>
<div style="margin: 0in 0in 0.0001pt;" class=""><font face="Calibri, sans-serif" class=""><span style="font-size: 15px;" class="">— the above three correspond to the last line in your trace ----</span></font></div>
<div style="margin: 0in 0in 0.0001pt;" class=""><font face="Calibri, sans-serif" class=""><span style="font-size: 15px;" class=""><br class="">
</span></font></div>
<div style="margin: 0in 0in 0.0001pt;" class=""><font face="Calibri, sans-serif" class="">
<div style="margin: 0in 0in 0.0001pt;" class=""><span style="font-size: 15px;" class="">1467225861.075402 DEBUG: [Forwarder] onIncomingNack face=263 nack=/localhop/NLSR/sync/e4c858598a526f7f25d42f4da49cb51b7950cf352e26d5092bd35126b509101b~Duplicate OK</span></div>
<div style="margin: 0in 0in 0.0001pt;" class=""><span style="font-size: 15px;" class=""><br class="">
</span></div>
<div style="margin: 0in 0in 0.0001pt;" class=""><span style="font-size: 15px;" class="">1467225861.075601 DEBUG: [Forwarder] onIncomingNack face=262 nack=/localhop/NLSR/sync/e4c858598a526f7f25d42f4da49cb51b7950cf352e26d5092bd35126b509101b~Duplicate OK</span></div>
<div style="margin: 0in 0in 0.0001pt;" class=""><span style="font-size: 15px;" class=""><br class="">
</span></div>
<div style="margin: 0in 0in 0.0001pt;" class=""><span style="font-size: 15px;" class="">— the above two message show that both B and C sent NACK-duplicate back to A — </span><span style="font-size: 15px;" class="">C has previously received the nonce 1547 from
A I think (A has expired the corresponding out record, </span><span style="font-size: 15px;" class="">but C has not deleted the in-record I guess). I’m not sure why B would also send a NACK-duplicate. Did it receive one with the nonce 6600 before from A?</span></div>
<div style="margin: 0in 0in 0.0001pt;" class=""><span style="font-size: 15px;" class=""><br class="">
</span></div>
<div style="margin: 0in 0in 0.0001pt;" class=""><span style="font-size: 15px;" class="">— according to your earlier email, these two NACKs would erase the corresponding in record at B and C.</span></div>
<div style="margin: 0in 0in 0.0001pt;" class=""><span style="font-size: 15px;" class=""><br class="">
</span></div>
<div style="margin: 0in 0in 0.0001pt;" class=""><span style="font-size: 15px;" class="">1467225861.224289 DEBUG: [Forwarder] onIncomingInterest face=262 interest=/localhop/NLSR/sync/e4c858598a526f7f25d42f4da49cb51b7950cf352e26d5092bd35126b509101b (B sent another
sync interest to A)</span></div>
<div style="margin: 0in 0in 0.0001pt;" class=""><span style="font-size: 15px;" class=""><br class="">
</span></div>
<div style="margin: 0in 0in 0.0001pt;" class="">
<div style="margin: 0in 0in 0.0001pt;" class=""><span style="font-size: 15px;" class="">1467225861.378008 DEBUG: [Forwarder] onIncomingInterest face=261 interest=/localhop/NLSR/sync/e4c858598a526f7f25d42f4da49cb51b7950cf352e26d5092bd35126b509101b (A’s app sent
a sync interest to A’s nfd)</span></div>
<div style="font-size: 15px;" class=""><br class="">
</div>
</div>
<div class="">
<div class=""><span style="font-size: 15px;" class="">1467225861.378105 DEBUG: [Forwarder] onContentStoreMiss interest=/localhop/NLSR/sync/e4c858598a526f7f25d42f4da49cb51b7950cf352e26d5092bd35126b509101b</span></div>
<div class=""><span style="font-size: 15px;" class="">1467225865.378406 DEBUG: [Forwarder] onInterestUnsatisfied interest=/localhop/NLSR/sync/e4c858598a526f7f25d42f4da49cb51b7950cf352e26d5092bd35126b509101b</span></div>
<div class=""><span style="font-size: 15px;" class="">1467225865.378471 DEBUG: [Forwarder] onInterestFinalize interest=/localhop/NLSR/sync/e4c858598a526f7f25d42f4da49cb51b7950cf352e26d5092bd35126b509101b unsatisfied</span></div>
<div class=""><span style="font-size: 15px;" class="">1467225865.528040 DEBUG: [Forwarder] onIncomingInterest face=263 interest=/localhop/NLSR/sync/e4c858598a526f7f25d42f4da49cb51b7950cf352e26d5092bd35126b509101b</span></div>
<div class=""><span style="font-size: 15px;" class="">1467225865.528083 DEBUG: [Forwarder] onContentStoreMiss interest=/localhop/NLSR/sync/e4c858598a526f7f25d42f4da49cb51b7950cf352e26d5092bd35126b509101b</span></div>
<div class=""><span style="font-size: 15px;" class="">1467225865.528126 DEBUG: [Forwarder] onOutgoingInterest face=261 interest=/localhop/NLSR/sync/e4c858598a526f7f25d42f4da49cb51b7950cf352e26d5092bd35126b509101b</span></div>
<div class=""><span style="font-size: 15px;" class=""><br class="">
</span></div>
<div class=""><span style="font-size: 15px;" class="">— the above shows that A did not send a sync interest to B and C after A’s app sent a sync interest to A’s nfd (there were no such messages between 61.3 and 65), which means that B and C won’t have the corresponding
in record (but for ChronoSync to work there needs to be a pending interest on each direction in every link).</span></div>
<div style="font-size: 15px;" class=""><br class="">
</div>
</div>
</font></div>
<div style="margin: 0in 0in 0.0001pt;" class=""><font face="Calibri, sans-serif" class=""><span style="font-size: 15px;" class="">Lan</span></font></div>
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Yours, Junxiao<o:p class=""></o:p></div>
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<b class="">From:<span class="Apple-converted-space"> </span></b><a href="mailto:lanwang@memphis.edu" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">Lan Wang (lanwang)</a><br class="">
<b class="">Sent:<span class="Apple-converted-space"> </span></b>Tuesday, July 12, 2016 09:28<br class="">
<b class="">To:<span class="Apple-converted-space"> </span></b><a href="mailto:shijunxiao@email.arizona.edu" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">Junxiao Shi</a><br class="">
<b class="">Cc:<span class="Apple-converted-space"> </span></b><a href="mailto:agawande@memphis.edu" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">Ashlesh Gawande (agawande)</a>;<span class="Apple-converted-space"> </span><a href="mailto:nfd-dev@lists.cs.ucla.edu" style="color: rgb(149, 79, 114); text-decoration: underline;" class="">nfd-dev@lists.cs.ucla.edu</a><br class="">
<b class="">Subject:<span class="Apple-converted-space"> </span></b>Re: [Nfd-dev] Help needed with debugging duplicate Nonce</div>
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<span style="color: rgb(255, 38, 0);" class="">When strategy instructs forwarder to<span class="apple-converted-space"> </span><u class="">send</u><span class="apple-converted-space"> </span>a Nack to face B, it removes the PIT in-record of face B. In case
the PIT entry is later satisfied by Data, face B would not receive a copy of this Data.</span><o:p class=""></o:p></div>
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<span style="font-size: 12pt; font-family: 'Times New Roman', serif;" class="">The above highlighted part is the problem. Since the in-record of face B is removed after sending the Nack, any Sync data packet generated by ChronoSync cannot be delivered to the
neighbor on face B. The neighbor would wait for the sync period to expire and resend the next Sync Interest to receive the data. This is the major problem caused by the duplicate Nacks (not just pure message overhead). </span></div>
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