[Nfd-dev] Expiration time of the RIB entry at the NDN nodes

[Lee, Jongdeog]

Hi Junxiao,

  Thanks for your reply. Regarding your answers and questions,

1.Which node did the prefix disappear from?
-> I am talking about the Illinois router

2. Is your pingserver constantly receiving Interests, or is it mostly idle?
-> It is mostly idle, especially between night and morning. And I guess the prefix disappeared during this period.

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 face_system.udp.idle_timeout<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=>.
-> Yes. I suspect this case. Let me check auto propagation log as your advice.

  So I guess if the pingserver is not idle, the prefix at the Illinois node would not be expired, right?

Best wishes,
Jongdeog Lee (JD)

------------------------------------------------
Ph.D. Student
Department of Computer Science
University of Illinois at Urbana-Champaign
________________________________
From: Junxiao Shi [shijunxiao at email.arizona.edu]
Sent: Tuesday, January 31, 2017 11:12 AM
To: Lee, Jongdeog
Cc: nfd-dev at lists.cs.ucla.edu
Subject: Re: [Nfd-dev] Expiration time of the RIB entry at the NDN nodes

Hi Jongdeog

Which node did the prefix disappear from?

On producer end host:
ndnpingserver is supposed to set the expiration time to "never", which means it should not disappear until ndnpingserver disconnects from local NFD.

On Illinois router:
Auto prefix propagation is supposed to refresh the registration periodically. The interval is controlled by rib.auto_prefix_propagate.refresh_interval<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=> config key.
To diagnose problems in this area, on the end host, set AutoPrefixPropagator=TRACE loglevel, and you can see whether there is any failed registrations.


Is your pingserver constantly receiving Interests, or is it mostly idle?
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.


>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?
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 face_system.udp.idle_timeout<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=>. 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.


Yours, Junxiao

On Tue, Jan 31, 2017 at 8:47 AM, Lee, Jongdeog <jlee700 at illinois.edu<mailto:jlee700 at illinois.edu>> wrote:
Dear nfd team,

  Hope all of you are doing fine.
  I have a question about expiration time of the RIB entry at the NDN nodes.

  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?

  Sorry if this question is duplicate.

Best wishes,
Jongdeog Lee (JD)

------------------------------------------------
Ph.D. Student
Department of Computer Science
University of Illinois at Urbana-Champaign

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