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<div>Hi all,</div>
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<div>We're seeing strange results from our latest experiments. Below is an ndndump trace of one ndnping packet from UCLA to CAIDA. We ran the experiments using mini-ndn. I'm also attaching a png file that shows where the Interests and Data packets were forwarded
(white is the original transmission of the Interest, yellow and blue indicate retransmissions of this Interest with the same nonce by different routers). </div>
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[Lans-MacBook-Air:test-ucla-ping-cpu-alloc-withNLSRlog-timing/ls/faces-2] lanwang1% grep "/ndn/edu/caida/ping/251436634" */dump* | sort -t ":" -k 2 | more<br>
ucla/dump.0ucla:1425075159.119036 From: 1.0.0.42, To: 1.0.0.41, Tunnel Type: UDP, INTEREST: /ndn/edu/caida/ping/251436634?ndn.MustBeFresh=1&ndn.Nonce=251436634, size: 48<br>
csu/dump.0csu:1425075159.119112 From: 1.0.0.42, To: 1.0.0.41, Tunnel Type: UDP, INTEREST: /ndn/edu/caida/ping/251436634?ndn.MustBeFresh=1&ndn.Nonce=251436634, size: 48<br>
csu/dump.4csu:1425075159.140391 From: 1.0.0.29, To: 1.0.0.30, Tunnel Type: UDP, INTEREST: /ndn/edu/caida/ping/251436634?ndn.MustBeFresh=1&ndn.Nonce=251436634, size: 48<br>
memphis/dump.1memphis:1425075159.140488 From: 1.0.0.29, To: 1.0.0.30, Tunnel Type: UDP, INTEREST: /ndn/edu/caida/ping/251436634?ndn.MustBeFresh=1&ndn.Nonce=251436634, size: 48<br>
ucla/dump.1ucla:1425075159.164108 From: 1.0.0.73, To: 1.0.0.74, Tunnel Type: UDP, INTEREST: /ndn/edu/caida/ping/251436634?ndn.MustBeFresh=1&ndn.Nonce=251436634, size: 48<br>
umich/dump.0umich:1425075159.164185 From: 1.0.0.73, To: 1.0.0.74, Tunnel Type: UDP, INTEREST: /ndn/edu/caida/ping/251436634?ndn.MustBeFresh=1&ndn.Nonce=251436634, size: 48<br>
umich/dump.2umich:1425075159.179542 From: 1.0.0.50, To: 1.0.0.49, Tunnel Type: UDP, INTEREST: /ndn/edu/caida/ping/251436634?ndn.MustBeFresh=1&ndn.Nonce=251436634, size: 48<br>
csu/dump.6csu:1425075159.179620 From: 1.0.0.50, To: 1.0.0.49, Tunnel Type: UDP, INTEREST: /ndn/edu/caida/ping/251436634?ndn.MustBeFresh=1&ndn.Nonce=251436634, size: 48<br>
memphis/dump.2memphis:1425075159.181041 From: 1.0.0.18, To: 1.0.0.17, Tunnel Type: UDP, INTEREST: /ndn/edu/caida/ping/251436634?ndn.MustBeFresh=1&ndn.Nonce=251436634, size: 48<br>
caida/dump.4caida:1425075159.181138 From: 1.0.0.18, To: 1.0.0.17, Tunnel Type: UDP, INTEREST: /ndn/edu/caida/ping/251436634?ndn.MustBeFresh=1&ndn.Nonce=251436634, size: 48<br>
caida/dump.4caida:1425075159.224372 From: 1.0.0.17, To: 1.0.0.18, Tunnel Type: UDP, DATA: /ndn/edu/caida/ping/251436634, size: 392<br>
memphis/dump.2memphis:1425075159.224444 From: 1.0.0.17, To: 1.0.0.18, Tunnel Type: UDP, DATA: /ndn/edu/caida/ping/251436634, size: 392<br>
memphis/dump.1memphis:1425075159.245821 From: 1.0.0.30, To: 1.0.0.29, Tunnel Type: UDP, DATA: /ndn/edu/caida/ping/251436634, size: 392<br>
csu/dump.4csu:1425075159.245887 From: 1.0.0.30, To: 1.0.0.29, Tunnel Type: UDP, DATA: /ndn/edu/caida/ping/251436634, size: 392<br>
csu/dump.0csu:1425075159.262268 From: 1.0.0.41, To: 1.0.0.42, Tunnel Type: UDP, DATA: /ndn/edu/caida/ping/251436634, size: 392<br>
ucla/dump.0ucla:1425075159.262344 From: 1.0.0.41, To: 1.0.0.42, Tunnel Type: UDP, DATA: /ndn/edu/caida/ping/251436634, size: 392<br>
umich/dump.4umich:1425075159.330700 From: 1.0.0.82, To: 1.0.0.81, Tunnel Type: UDP, INTEREST: /ndn/edu/caida/ping/251436634?ndn.MustBeFresh=1&ndn.Nonce=251436634, size: 48<br>
uiuc/dump.2uiuc:1425075159.330771 From: 1.0.0.82, To: 1.0.0.81, Tunnel Type: UDP, INTEREST: /ndn/edu/caida/ping/251436634?ndn.MustBeFresh=1&ndn.Nonce=251436634, size: 48<br>
uiuc/dump.0uiuc:1425075159.345166 From: 1.0.0.46, To: 1.0.0.45, Tunnel Type: UDP, INTEREST: /ndn/edu/caida/ping/251436634?ndn.MustBeFresh=1&ndn.Nonce=251436634, size: 48<br>
csu/dump.5csu:1425075159.345243 From: 1.0.0.46, To: 1.0.0.45, Tunnel Type: UDP, INTEREST: /ndn/edu/caida/ping/251436634?ndn.MustBeFresh=1&ndn.Nonce=251436634, size: 48<br>
csu/dump.5csu:1425075159.359534 From: 1.0.0.45, To: 1.0.0.46, Tunnel Type: UDP, DATA: /ndn/edu/caida/ping/251436634, size: 392<br>
uiuc/dump.0uiuc:1425075159.359617 From: 1.0.0.45, To: 1.0.0.46, Tunnel Type: UDP, DATA: /ndn/edu/caida/ping/251436634, size: 392<br>
uiuc/dump.2uiuc:1425075159.365972 From: 1.0.0.81, To: 1.0.0.82, Tunnel Type: UDP, DATA: /ndn/edu/caida/ping/251436634, size: 392<br>
umich/dump.4umich:1425075159.366036 From: 1.0.0.81, To: 1.0.0.82, Tunnel Type: UDP, DATA: /ndn/edu/caida/ping/251436634, size: 392<br>
umich/dump.0umich:1425075159.399394 From: 1.0.0.74, To: 1.0.0.73, Tunnel Type: UDP, DATA: /ndn/edu/caida/ping/251436634, size: 392<br>
ucla/dump.1ucla:1425075159.399522 From: 1.0.0.74, To: 1.0.0.73, Tunnel Type: UDP, DATA: /ndn/edu/caida/ping/251436634, size: 392
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<div>Since all these Interests were duplicates of the original Interest, there should be only one copy of the Data packet going back to the ndnping client, but it seems that the Data came back in two paths:</div>
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<div>- CAIDA -> Memphis -> CSU -> UCLA</div>
<div>- CAIDA -> Memphis -> CSU -> UIUC -> UMich -> UCLA</div>
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<div>Seems that CSU was not doing duplicate Interest suppression correctly. The Interest from UIUC to CSU received at time 1425075159.345243 should have been dropped because it's a duplicate of the earlier Interest from UCLA to CSU received at time 1425075159.119112,
but it was not and instead brought data back. The time difference between the two Interests is 226ms. I'm not sure how the duplicate suppression is implemented. Someone more familiar with the forwarding pipeline please help explain the above trace. Thanks.</div>
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<div apple-content-edited="true">Lan</div>
<img id="bf6c3039-422e-4655-9fed-5c99146bc4d0" height="480" width="622" apple-width="yes" apple-height="yes" src="cid:59468F57-8C20-45FA-AD6A-C6E51220647E"></div>
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