<div dir="ltr">Hi Justin,<div><br></div><div>What I think Ryan is getting at is that packet loss at a single hop just means that hop is rate-limiting ICMP. It's not a cause for concern. If you see cascading loss (loss starting at one hop and persisting through all subsequent hops), then that <i>is</i> a cause for concern.</div><div><br></div><div>FWIW I checked my monitoring to a target in Level3's network in DC and I don't see any issues.</div><div><br></div><div>-Ross</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, May 10, 2019 at 9:47 PM Ryan Kearney via Outages <<a href="mailto:outages@outages.org">outages@outages.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Read this<br>
<br>
<a href="https://www.nanog.org/meetings/nanog47/presentations/Sunday/RAS_Traceroute_N47_Sun.pdf" rel="noreferrer" target="_blank">https://www.nanog.org/meetings/nanog47/presentations/Sunday/RAS_Traceroute_N47_Sun.pdf</a><br>
<br>
On Fri, May 10, 2019 at 8:36 PM Justin Kinney via Outages<br>
<<a href="mailto:outages@outages.org" target="_blank">outages@outages.org</a>> wrote:<br>
><br>
> seeing large amounts of packet loss between from Level 3 in Washington, DC. Anyone else?<br>
><br>
> Snippet of an MTR:<br>
><br>
> 9.|-- <a href="http://9-1-21.bear2.Washington111.Level3.net" rel="noreferrer" target="_blank">9-1-21.bear2.Washington111.Level3.net</a> 0.0% 10 1.5 1.9 1.3 4.4 0.8<br>
> 10.|-- <a href="http://ae-1-3502.ear2.Washington12.Level3.net" rel="noreferrer" target="_blank">ae-1-3502.ear2.Washington12.Level3.net</a> 90.0% 10 1.9 1.9 1.9 1.9 0.0<br>
> 11.|-- <a href="http://ix-ae-36-0.tcore1.aeq-ashburn.as6453.net" rel="noreferrer" target="_blank">ix-ae-36-0.tcore1.aeq-ashburn.as6453.net</a> 0.0% 10 15.4 3.5 1.5 15.4 4.4<br>
> 12.|-- <a href="http://if-ae-2-2.tcore2.aeq-ashburn.as6453.net" rel="noreferrer" target="_blank">if-ae-2-2.tcore2.aeq-ashburn.as6453.net</a> 0.0% 10 209.4 209.6 209.4 210.2 0.0<br>
> 13.|-- <a href="http://if-ae-12-4.tcore4.njy-newark.as6453.net" rel="noreferrer" target="_blank">if-ae-12-4.tcore4.njy-newark.as6453.net</a> 0.0% 10 210.1 210.2 209.9 210.7 0.0<br>
> 14.|-- <a href="http://if-ae-1-3.tcore3.njy-newark.as6453.net" rel="noreferrer" target="_blank">if-ae-1-3.tcore3.njy-newark.as6453.net</a> 0.0% 10 209.0 209.0 208.9 209.3 0.0<br>
> 15.|-- <a href="http://if-ae-15-2.tcore1.l78-london.as6453.net" rel="noreferrer" target="_blank">if-ae-15-2.tcore1.l78-london.as6453.net</a> 0.0% 10 208.9 209.1 208.9 209.5 0.0<br>
> 16.|-- <a href="http://if-ae-3-2.tcore1.pye-paris.as6453.net" rel="noreferrer" target="_blank">if-ae-3-2.tcore1.pye-paris.as6453.net</a> 0.0% 10 209.3 209.5 209.3 210.4 0.0<br>
> 17.|-- <a href="http://if-ae-8-1600.tcore1.wyn-marseille.as6453.net" rel="noreferrer" target="_blank">if-ae-8-1600.tcore1.wyn-marseille.as6453.net</a> 0.0% 10 200.6 201.9 200.4 213.4 4.0<br>
> 18.|-- <a href="http://if-ae-5-6.tcore1.mlv-mumbai.as6453.net" rel="noreferrer" target="_blank">if-ae-5-6.tcore1.mlv-mumbai.as6453.net</a> 90.0% 10 211.0 211.0 211.0 211.0 0.0<br>
> 19.|-- <a href="http://if-ae-2-2.tcore2.mlv-mumbai.as6453.net" rel="noreferrer" target="_blank">if-ae-2-2.tcore2.mlv-mumbai.as6453.net</a> 0.0% 10 203.6 203.8 203.5 204.1 0.0<br>
> 20.|-- <a href="http://if-ae-9-2.tcore2.cxr-chennai.as6453.net" rel="noreferrer" target="_blank">if-ae-9-2.tcore2.cxr-chennai.as6453.net</a> 0.0% 10 203.6 205.6 203.1 225.6 7.0<br>
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