CDN Packet Loss?

by Dave S - Member - 10:11PM, May 15, 2008

I don’t know if this is the case across the board, but there seems to be some packet loss from all the CDN servers (assuming the CDN is back online now?).

 Vancouver, Canada         Packets lost (70%)      138.9     139.1     139.5 
 New York, U.S.A.          Packets lost (80%)       80.8      80.8      80.9 
 Austin2, U.S.A.           Packets lost (50%)      116.1     116.3     116.4 
 San Francisco, U.S.A.     Packets lost (60%)      152.5     152.7     152.8 
 Santa Clara, U.S.A.       Packets lost (80%)      183.2     184.4     185.6 
 Austin, U.S.A.            Packets lost (70%)      116.2     116.3     116.4 
 Amsterdam2, Netherlands   Packets lost (80%)        8.4       8.7       8.9 
 Amsterdam3, Netherlands   Packets lost (80%)        8.1       8.2       8.4 
 London, United Kingdom    Packets lost (90%)        1.5       1.5       1.5 
 Cologne, Germany          Packets lost (40%)       14.2      14.4      14.8 
 Stockholm, Sweden         Packets lost (10%)       39.4      39.6      39.7 
 Paris, France             Packets lost (80%)        7.9       8.0       8.1 
 Florida, U.S.A.           Packets lost (70%)      121.8     127.3     138.2 
 Krakow, Poland            Packets lost (90%)       39.4      39.4      39.4 
 Munchen, Germany          Packets lost (60%)       17.9      18.3      19.4 
 Lille, France             Packets lost (90%)       12.3      12.3      12.3 
 Amsterdam, Netherlands    Packets lost (90%)       11.5      11.5      11.5 
 Copenhagen, Denmark       Packets lost (50%)       27.7      27.9      28.0 
 Cagliari, Italy           Packets lost (70%)       43.8      44.3      44.5 
 Hong Kong, China          Packets lost (70%)      324.2     331.8     346.8 
 Porto Alegre, Brazil      Packets lost (70%)      230.4     240.7     247.0 
 Singapore, Singapore      Packets lost (60%)      347.2     349.8     351.5 
 Melbourne, Australia      Packets lost (40%)      327.8     330.8     333.1 
 Shanghai, China           Packets lost (50%)      334.0     334.2     334.5 
 Sydney, Australia         Packets lost (80%)      316.1     316.3     316.5 
 Madrid, Spain             Packets lost (100%)

Last edited 10:11PM, May 15, 2008

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Jasper

Member

03:10AM, May 16, 2008

Hi Dave, I’m from IndyNET, the CDN provider that Shopify is now using.

Earlier today we deployed a change to our Extreme Networks switching equipment worldwide that rate-limited incoming ICMP echo requests to reduce network load and improve performance.

Since it appears to cause some alarm with customers (we’ve had several frantic emails as well as your forum post!) we’ve reversed the change, even though it of course didn’t affect any real services, just people pinging the servers…

The Pingdom page (linked below) remains the authoritative indicator of which servers are up, as it uses HTTP to perform the test.

Note that if a server shows as down on Pingdom, this would normally not mean that customers were unable to hit the CDN from that area, because requests would be automatically rerouted to the next closest server. We’re planning on adding a publicly-visible check to Pingdom that tests “CDN availability” from various places, once we’ve determined the best way to do that.

http://www.pingdom.com/reports/3zsdtxreupn9/

Kind regards,
Jasper Bryant-Greene
IndyNET CDN

Dave S

Member

11:20AM, May 16, 2008

Thanks for the quick response Jasper.

I wasn’t too worried at the site was loading fine for me, and if the change improves service, then I’m all for it!

I just wanted to double check that our international customers were managing to get through ok.

Thanks again,

Dave