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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Hi Junxiao,<br>
<br>
Thanks for your reply. Regarding your answers and questions,<br>
<div><br>
1.<span dir="ltr">Which node did the prefix disappear from?</span><br>
-> I am talking about the Illinois router<br>
<br>
2. Is your pingserver constantly receiving Interests, or is it mostly idle?<br>
-> It is mostly idle, especially between night and morning. And I guess the prefix disappeared during this period.
<br>
<br>
3. If the face has disappeared or FaceId has changed, this indicates there has been no traffic (registration packets or Data) from the producer end host for longer than<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_named-2Ddata_NFD_blob_c31080d47048eb2598f0f491655d1e6f26d0fa05_nfd.conf.sample.in-23L116&d=DwMFaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=Z7ZyWHGeVXO4-LRL2FeI1ZE8d269MMOL_mjEf1LVJpE&m=QsMzIxn98Vt7BO3MepBiqT6g2quOqTeIw23Q-0lCcLk&s=mNxokWfPAvrTHE3OnaoZz1lMK5JfgL9nbs6ufPSdP44&e=" target="_blank">
face_system.udp.idle_timeout</a>. <br>
-> Yes. I suspect this case. Let me check auto propagation log as your advice.<br>
<br>
So I guess if the pingserver is not idle, the prefix at the Illinois node would not be expired, right?<br>
<br>
Best wishes,<br>
<div style="font-family:Tahoma; font-size:13px">
<div style="font-family:Tahoma; font-size:13px">
<div>Jongdeog Lee (JD)</div>
<div><br>
</div>
<div>------------------------------------------------</div>
<div><i>Ph.D. Student</i></div>
<div><i>Department of Computer Science</i></div>
<div><i>University of Illinois at Urbana-Champaign</i></div>
</div>
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<div id="divRpF299639" style="direction: ltr;"><font size="2" color="#000000" face="Tahoma"><b>From:</b> Junxiao Shi [shijunxiao@email.arizona.edu]<br>
<b>Sent:</b> Tuesday, January 31, 2017 11:12 AM<br>
<b>To:</b> Lee, Jongdeog<br>
<b>Cc:</b> nfd-dev@lists.cs.ucla.edu<br>
<b>Subject:</b> Re: [Nfd-dev] Expiration time of the RIB entry at the NDN nodes<br>
</font><br>
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<div></div>
<div>
<div dir="ltr">Hi Jongdeog
<div><br>
</div>
<div>Which node did the prefix disappear from?</div>
<div><br>
</div>
<div>On <b>producer end host</b>:</div>
<div>ndnpingserver is supposed to set the expiration time to "never", which means it should not disappear until ndnpingserver disconnects from local NFD.<br>
</div>
<div><br>
</div>
<div>On <b>Illinois router</b>:</div>
<div>Auto prefix propagation is supposed to refresh the registration periodically. The interval is controlled by
<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_named-2Ddata_NFD_blob_c31080d47048eb2598f0f491655d1e6f26d0fa05_nfd.conf.sample.in-23L359&d=DwMFaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=Z7ZyWHGeVXO4-LRL2FeI1ZE8d269MMOL_mjEf1LVJpE&m=QsMzIxn98Vt7BO3MepBiqT6g2quOqTeIw23Q-0lCcLk&s=k6KwRSVHyFyoa6u-Zczag2Mz9w1lNFFDxxe7Ji3aSyg&e=" target="_blank">
rib.auto_prefix_propagate.<wbr>refresh_interval</a> config key.</div>
<div>To diagnose problems in this area, on the end host, set AutoPrefixPropagator=TRACE loglevel, and you can see whether there is any failed registrations.<br>
</div>
<div><br>
</div>
<div><br>
</div>
<div>Is your pingserver constantly receiving Interests, or is it mostly idle?</div>
<div>A mostly idle producer would rely on the registration packets to keep the face alive at router side. A busy producer sends Data to keep the face alive.</div>
<div><br>
</div>
<div><br>
</div>
<div>From Illinois router side, after the prefix has disappeared, do you still see a face going to the producer end host? Is the FaceId same as the FaceId when you first start the producer end host?</div>
<div>If the face has disappeared or FaceId has changed, this indicates there has been no traffic (registration packets or Data) from the producer end host for longer than
<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_named-2Ddata_NFD_blob_c31080d47048eb2598f0f491655d1e6f26d0fa05_nfd.conf.sample.in-23L116&d=DwMFaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=Z7ZyWHGeVXO4-LRL2FeI1ZE8d269MMOL_mjEf1LVJpE&m=QsMzIxn98Vt7BO3MepBiqT6g2quOqTeIw23Q-0lCcLk&s=mNxokWfPAvrTHE3OnaoZz1lMK5JfgL9nbs6ufPSdP44&e=" target="_blank">
face_system.udp.idle_timeout</a>. Once the new face (with a new FaceId) is established by a new registration packet, that registration may be failing (and you'll see why by setting AutoPrefixPropagator=TRACE loglevel at producer end host) so you don't see the
prefix.</div>
<div><br>
</div>
<div><br>
</div>
<div>Yours, Junxiao<br>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Tue, Jan 31, 2017 at 8:47 AM, Lee, Jongdeog <span dir="ltr">
<<a href="mailto:jlee700@illinois.edu" target="_blank">jlee700@illinois.edu</a>></span> wrote:<br>
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<div style="direction:ltr; font-family:tahoma; color:rgb(0,0,0); font-size:10pt">
Dear nfd team,<br>
<br>
Hope all of you are doing fine.<br>
I have a question about expiration time of the RIB entry at the NDN nodes.<br>
<br>
Suppose that my producer successfully registered one prefix at the Illinois node (through auto prefix propagation). And I keep running ndnpingserver on the producer side. Empirically, it seems the prefix is expired after a day. How can I control the expiration
time? If I want to register it longer, should I periodically register the prefix?<br>
<br>
Sorry if this question is duplicate.<br>
<br>
<div>Best wishes,<br>
<div style="font-family:tahoma; font-size:13px">
<div style="font-family:tahoma; font-size:13px">
<div>Jongdeog Lee (JD)</div>
<div><br>
</div>
<div>------------------------------<wbr>------------------</div>
<div><i>Ph.D. Student</i></div>
<div><i>Department of Computer Science</i></div>
<div><i>University of Illinois at Urbana-Champaign</i></div>
</div>
</div>
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</blockquote>
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