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<span style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:11pt; color:black">Thanks, Alex. Peter, can you explain where you were seeing this? I thought it was with an app face, not udp...<br>
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<span style="color:black">-----Original Message----- <br>
<b>From:</b> Alex Afanasyev [alexander.afanasyev@ucla.edu]<br>
<b>Received:</b> Friday, 13 Mar 2015, 4:25PM<br>
<b>To:</b> Burke, Jeff [jburke@remap.ucla.edu]<br>
<b>CC:</b> nfd-dev@lists.cs.ucla.edu [nfd-dev@lists.cs.ucla.edu]<br>
<b>Subject:</b> Re: [Nfd-dev] Behavior of "on demand" faces to applications<br>
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<div class="">On Mar 13, 2015, at 4:13 PM, Burke, Jeff <<a href="mailto:jburke@remap.UCLA.EDU" class="">jburke@remap.UCLA.EDU</a>> wrote:</div>
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<div class="">Hi folks,</div>
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<div class="">Could you please confirm the default behavior of "on-demand" face creation for applications?</div>
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<div class="">My understanding: The face created by default when an application registers a prefix is "on demand", meaning it can be destroyed by NFD if inactive for some timeout period.</div>
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Not exactly (may be I misunderstood the question). Whenever face is created by an explicit command, it is “persistent” (we also reserved concept “permanent”, but it is not yet implemented).</div>
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<div>On-demand face is face that is created as a response of incoming tcp connect or packet received on UDP face. Only UDP face can get destroyed, TCP faces exist for as long tcp connection is alive.</div>
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<div>If you’re referring to the UDP face from the the other side of tunnel, then yes. That face is on-demand and can be destroyed on the other side if no traffic.</div>
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<div>Remote registration built in into NFD/RIB management can take care of proper refreshing state. This is currently implemented, but requires some conventions on registered namespaces / available keys (it is documented in TR Yanbiao is working).</div>
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<div class="">This behavior has caused some troubleshooting challenges with a long-running publisher and occasionally interested consumers. </div>
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<div class="">Some questions:</div>
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<div class="">- Where is this behavior documented? It is mentioned in p10 of the developer's guide, but I can't find either the constant or configuration parameter that sets it. </div>
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<div>Some documentation regarding default values used is also available in nfd.conf.sample.</div>
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<div class="">- Is it the case that on-demand faces will not be destroyed if any traffic has traversed them? Or just that no traffic has traversed during the timeout interval? </div>
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<div>Not sure I understood the question. on-demand udp face will not be destroyed if at least one packet (data/interest) is received during the timeout interval.</div>
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<div class="">- What is the appropriate way to create a face that persists until the process that created it is either destroyed or unregistered the prefix? </div>
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<div>Rely on remote registration process (I would say this is preferred). Alternatively, this could be something else that periodically send interest towards the remote end.</div>
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<div class="">Thank you,</div>
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