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FYI, some information about the overlay link loss rate (measured with ping) over the testbed. Loss rate is pretty low, e.g., 10 losses out of 100000 between UCLA and PKU at 100 pings per second (see below).<br>
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<br class="Apple-interchange-newline">
Lan</div>
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<div>Begin forwarded message:</div>
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<span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1.0);"><b>From:
</b></span><span style="font-family:'Helvetica'; font-size:medium;">John DeHart <<a href="mailto:jdd@seas.wustl.edu">jdd@seas.wustl.edu</a>><br>
</span></div>
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<span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1.0);"><b>Subject:
</b></span><span style="font-family:'Helvetica'; font-size:medium;"><b>Re: Loss Rate</b><br>
</span></div>
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<span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1.0);"><b>Date:
</b></span><span style="font-family:'Helvetica'; font-size:medium;">August 19, 2014 3:30:23 PM CDT<br>
</span></div>
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<span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1.0);"><b>To:
</b></span><span style="font-family:'Helvetica'; font-size:medium;">"Lan Wang (lanwang)" <<a href="mailto:lanwang@memphis.edu">lanwang@memphis.edu</a>>, "<a href="mailto:marcsb@bellsouth.net">marcsb@bellsouth.net</a>" <<a href="mailto:marcsb@bellsouth.net">marcsb@bellsouth.net</a>><br>
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<span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1.0);"><b>Cc:
</b></span><span style="font-family:'Helvetica'; font-size:medium;">"<a href="mailto:obaidasyed@gmail.com">obaidasyed@gmail.com</a>" <<a href="mailto:obaidasyed@gmail.com">obaidasyed@gmail.com</a>><br>
</span></div>
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100,000 ping requests:<br>
<br>
UCLA (spurs) to PKU (loss of 10 packets)<br>
<br>
ndnops@spurs:~$ sudo ping -q -i 0.01 -c 100000 162.105.146.26<br>
PING 162.105.146.26 (162.105.146.26) 56(84) bytes of data.<br>
<br>
--- 162.105.146.26 ping statistics ---<br>
100000 packets transmitted, 99990 received, 0% packet loss, time 1112399ms<br>
rtt min/avg/max/mdev = 148.080/155.447/970.675/43.102 ms, pipe 96<br>
<br>
<br>
<br>
TONGJI to CAIDA (loss of 8 packets):<br>
<br>
ndnops@ndnops:~$ sudo ping -q -i 0.01 -c 100000 <a href="http://click.caida.org">
click.caida.org</a><br>
PING <a href="http://click.caida.org">click.caida.org</a> (192.172.226.248) 56(84) bytes of data.<br>
<br>
--- <a href="http://click.caida.org">click.caida.org</a> ping statistics ---<br>
100000 packets transmitted, 99992 received, 0% packet loss, time 1371267ms<br>
rtt min/avg/max/mdev = 181.647/202.676/251.866/12.110 ms, pipe 19<br>
<br>
<div class="moz-cite-prefix">On 8/19/14, 2:37 PM, John DeHart wrote:<br>
</div>
<blockquote cite="mid:53F3A75D.9000006@seas.wustl.edu" type="cite"><br>
And here is a similar pair of results for 10000 pings trying at 100 requests per second.<br>
Let me know if this level of result helps at all.<br>
<br>
UCLA (spurs) to PKU:<br>
<br>
ndnops@spurs:~$ sudo ping -q -i 0.01 -c 10000 162.105.146.26<br>
PING 162.105.146.26 (162.105.146.26) 56(84) bytes of data.<br>
<br>
--- 162.105.146.26 ping statistics ---<br>
10000 packets transmitted, 10000 received, 0% packet loss, time 109146ms<br>
rtt min/avg/max/mdev = 148.050/154.401/631.033/39.391 ms, pipe 63<br>
ndnops@spurs:~$<br>
<br>
<br>
TONGJI to CAIDA (1 loss out of 10000)<br>
<br>
ndnops@ndnops:~$ sudo ping -q -i 0.01 -c 10000 <a href="http://click.caida.org">click.caida.org</a><br>
PING <a href="http://click.caida.org">click.caida.org</a> (192.172.226.248) 56(84) bytes of data.<br>
<br>
--- <a href="http://click.caida.org">click.caida.org</a> ping statistics ---<br>
10000 packets transmitted, 9999 received, 0% packet loss, time 136946ms<br>
rtt min/avg/max/mdev = 181.710/193.677/210.785/5.104 ms, pipe 17<br>
ndnops@ndnops:~$<br>
<div class="moz-cite-prefix">On 8/19/14, 2:22 PM, John DeHart wrote:<br>
</div>
<blockquote cite="mid:53F3A3FE.1020307@seas.wustl.edu" type="cite"><br>
Here are two initial tests doing 1000 ping requests,<br>
using approximately 10 ping requests per second.<br>
<br>
UCLA (spurs) to PKU:<br>
ndnops@spurs:~$ sudo ping -q -i 0.1 -c 1000 162.105.146.26<br>
PING 162.105.146.26 (162.105.146.26) 56(84) bytes of data.<br>
<br>
--- 162.105.146.26 ping statistics ---<br>
1000 packets transmitted, 1000 received, 0% packet loss, time 100958ms<br>
rtt min/avg/max/mdev = 148.277/166.666/597.244/67.553 ms, pipe 6<br>
<br>
<br>
<br>
TONGJI to CAIDA:<br>
ndnops@ndnops:~$ sudo ping -q -i 0.1 -c 1000 <a href="http://click.caida.org">click.caida.org</a><br>
PING <a href="http://click.caida.org">click.caida.org</a> (192.172.226.248) 56(84) bytes of data.<br>
<br>
--- <a href="http://click.caida.org">click.caida.org</a> ping statistics ---<br>
1000 packets transmitted, 1000 received, 0% packet loss, time 106763ms<br>
rtt min/avg/max/mdev = 181.729/224.260/270.358/19.935 ms, pipe 3<br>
<br>
<br>
<br>
John<br>
<br>
<div class="moz-cite-prefix">On 8/19/14, 2:15 PM, John DeHart wrote:<br>
</div>
<blockquote cite="mid:53F3A26E.6000203@seas.wustl.edu" type="cite"><br>
Lan,<br>
<br>
The other issue I am encountering as I try some initial tests is<br>
that not all sites seem to allow pings. For instance, Tongji,<br>
one of the ones we would be most interested in, does not seem<br>
to allow pings.<br>
<br>
John<br>
<br>
<div class="moz-cite-prefix">On 8/19/14, 2:09 PM, John DeHart wrote:<br>
</div>
<blockquote cite="mid:53F3A0DC.6000202@seas.wustl.edu" type="cite"><br>
Lan,<br>
<br>
How urgent is this? Are you trying to get some results before NDNComm?<br>
<br>
John<br>
<br>
<div class="moz-cite-prefix">On 8/19/14, 8:56 AM, Lan Wang (lanwang) wrote:<br>
</div>
<blockquote cite="mid:90fkma891go195hk07blahkn.1408456607510@email.android.com" type="cite">
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John,
<div><br>
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<div>For the international links, I am guessing 1 in 1000 or more. Domestic ones may be lower (1 in 10000?) These are overlay links, so they should have higher loss rate than a single physical link.</div>
<div><br>
</div>
<div>Lan</div>
<br>
<br>
<br>
-------- Original message --------<br>
From: John DeHart <a moz-do-not-send="true" class="moz-txt-link-rfc2396E" href="mailto:jdd@seas.wustl.edu">
<jdd@seas.wustl.edu></a> <br>
Date: 08/18/2014 7:36 PM (GMT-06:00) <br>
To: "Lan Wang (lanwang)" <a moz-do-not-send="true" class="moz-txt-link-rfc2396E" href="mailto:lanwang@memphis.edu">
<lanwang@memphis.edu></a>,<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:marcsb@bellsouth.net">marcsb@bellsouth.net</a>
<br>
Cc: <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:obaidasyed@gmail.com">
obaidasyed@gmail.com</a> <br>
Subject: Re: Loss Rate <br>
<br>
<br>
<div><br>
Lan,<br>
<br>
What are you expecting the loss rates to be? Are you expecting 1 in a million?<br>
<br>
I would think we would have to run ping for a long time to get an accurate picture of the loss rate on a link.<br>
<br>
John<br>
<br>
<div class="moz-cite-prefix">On 8/18/14, 6:15 PM, Lan Wang (lanwang) wrote:<br>
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John,
<div><br>
</div>
<div>Sorry for the lack of details. Marc should have given you some background. We are trying to emulate the testbed and losses are an important characteristic of the topology that can affect the behavior of the protocols and performance. It is also good
for testing the robustness of our design and implementation. Right now we do not have a good idea of the loss rate on the testbed links.</div>
<div><br>
</div>
<div>We are mainly interested in losses from one nic to another nic. I think running a continuous ping with one packet every second would be good enough.</div>
<div><br>
</div>
<div>Lan</div>
<br>
<br>
<br>
-------- Original message --------<br>
From: John DeHart <a moz-do-not-send="true" class="moz-txt-link-rfc2396E" href="mailto:jdd@seas.wustl.edu">
<jdd@seas.wustl.edu></a> <br>
Date: 08/18/2014 4:23 PM (GMT-06:00) <br>
To: <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:marcsb@bellsouth.net">
marcsb@bellsouth.net</a> <br>
Cc: <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:obaidasyed@gmail.com">
obaidasyed@gmail.com</a>,"Lan Wang (lanwang)" <a moz-do-not-send="true" class="moz-txt-link-rfc2396E" href="mailto:lanwang@memphis.edu">
<lanwang@memphis.edu></a> <br>
Subject: Re: Loss Rate <br>
<br>
<br>
<div><br>
Marc,<br>
<br>
Wow. That sounds like a simple question but I'm guessing it opens up a lot of possibilities.<br>
Do you guys have something that you do on your local testbed already?<br>
<br>
What is it you are really interested in? Are you looking for losses from when<br>
data leaves one NIC to when it arrives at the remote NIC<br>
or are you looking for losses from sending process to receiving process?<br>
<br>
John<br>
<br>
<div class="moz-cite-prefix">On 8/18/14, 2:50 PM, Marc Badrian wrote:<br>
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<div class="" style=""><span class="" style="">Hey John,</span></div>
<div class="" style=""><span class="" style=""><br class="" style="">
</span></div>
<div class="" style=""><span class="" style=""><br class="" style="">
</span></div>
<div class="" style=""><span class="" style="">Is there a</span><span class="" style="font-size:10pt">ny way you could get the loss rate for each link/between each site for the current testbed topology?</span></div>
<div class="" style=""> </div>
<div class="" style=""><br>
</div>
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</div>
<div class="" style="">Thanks,</div>
<div class="" style=""><br>
</div>
<div class="" style="">- Marc</div>
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