[ndnSIM] ndnSIM - Producer problem

[Lixia Zhang]

> On Aug 17, 2017, at 10:21 AM, Junxiao Shi <shijunxiao at email.arizona.edu> wrote:
> 
> Hi Marzieh
> 
> I see no problem in NFD configuration or routing setup.
> There was a packet loss. When Data was returned from node 2 to node 1, it was not received by node 1.
> 
> As recommended by the NDN protocol, the consumer should retransmit the Interest if it does not receive the Data but still wants the Data. Moreoever, this retransmission should occur before InterestLifetime expires. This point is not correctly implemented in the consumer.
> 
> Also, NFD has a NDNLP reliability improvement option, which can perform hop-by-hop retransmission. It has been merged into NFD codebase and will apeear in next ndnSIM release. Per-hop reliability is more suitable than consumer retransmission, as I assume the packet loss was caused by interference or thermal noise in wireless channel.

I would like to make a different statement here: this is not a suitability question. 
1/ Consumer retransmission is always needed; one must not solely rely on network to reliably delivery every packet.

2/ Yes improved delivery reliability can help, and some time help greatly.

> You may wait for the next release and retry this simulation with reliability enabled.
> 
> Yours, Junxiao
> 
> On Thu, Aug 17, 2017 at 09:25 Marzieh Babaeianjelodar <babaeim at clarkson.edu <mailto:babaeim at clarkson.edu>> wrote:
> Hi Junxiao,
> 
> Thanks for your response and your time,
> 
> I filtered out the logs to the forwarder, and this is what I get for one Interest (I used Consumber Batches to send 1 Interest packet at second 2):
> 
> 2s 0 nfd.Forwarder:onIncomingInterest(): [DEBUG] onIncomingInterest face=259 interest=/test/prefix/%FE%00
> 2s 0 nfd.Forwarder:onContentStoreMiss(): [DEBUG] onContentStoreMiss interest=/test/prefix/%FE%00
> 2s 0 nfd.Forwarder:onOutgoingInterest(): [DEBUG] onOutgoingInterest face=257 interest=/test/prefix/%FE%00
> 2.00005s 1 nfd.Forwarder:onIncomingInterest(): [DEBUG] onIncomingInterest face=257 interest=/test/prefix/%FE%00
> 2.00005s 1 nfd.Forwarder:onContentStoreMiss(): [DEBUG] onContentStoreMiss interest=/test/prefix/%FE%00
> 2.00005s 1 nfd.Forwarder:onOutgoingInterest(): [DEBUG] onOutgoingInterest face=256 interest=/test/prefix/%FE%00
> 2.0001s 0 nfd.Forwarder:onIncomingInterest(): [DEBUG] onIncomingInterest face=256 interest=/test/prefix/%FE%00
> 2.0001s 0 nfd.Forwarder:onInterestLoop(): [DEBUG] onInterestLoop face=256 interest=/test/prefix/%FE%00 send-Nack-duplicate
> 2.0001s 2 nfd.Forwarder:onIncomingInterest(): [DEBUG] onIncomingInterest face=256 interest=/test/prefix/%FE%00
> 2.0001s 2 nfd.Forwarder:onContentStoreMiss(): [DEBUG] onContentStoreMiss interest=/test/prefix/%FE%00
> 2.0001s 2 nfd.Forwarder:onOutgoingInterest(): [DEBUG] onOutgoingInterest face=259 interest=/test/prefix/%FE%00
> 2.0001s 2 nfd.Forwarder:onIncomingData(): [DEBUG] onIncomingData face=259 data=/test/prefix/%FE%00
> 2.0001s 2 nfd.Forwarder:onIncomingData(): [DEBUG] onIncomingData matching=/test/prefix/%FE%00
> 2.0001s 2 nfd.Forwarder:onOutgoingData(): [DEBUG] onOutgoingData face=256 data=/test/prefix/%FE%00
> 2.1001s 2 nfd.Forwarder:onInterestFinalize(): [DEBUG] onInterestFinalize interest=/test/prefix/%FE%00 satisfied
> 4s 0 nfd.Forwarder:onInterestUnsatisfied(): [DEBUG] onInterestUnsatisfied interest=/test/prefix/%FE%00
> 4s 0 nfd.Forwarder:onInterestFinalize(): [DEBUG] onInterestFinalize interest=/test/prefix/%FE%00 unsatisfied
> 4.00005s 1 nfd.Forwarder:onInterestUnsatisfied(): [DEBUG] onInterestUnsatisfied interest=/test/prefix/%FE%00
> 4.00005s 1 nfd.Forwarder:onInterestFinalize(): [DEBUG] onInterestFinalize interest=/test/prefix/%FE%00 unsatisfied
> 
> Best Regards,
> Marzieh
> 
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