MTU issues s0.wp.com

Tue Nov 6 14:03:39 UTC 2012

> Is anyone else experiencing similar issues?

Not from here (AS 2116, Norway). No problem getting up the web page,
tcpdump shows MSS 1440.

> My traceroute shows they are employing a CDN for s0.wp.com, so not 
> everyone might be affected.
> 
>   7  asd2-rou-1022.NL.eurorings.net (2001:680:0:800f::291)  6.460 ms 
> 6.203 ms  6.188 ms
>   8  asd2-rou-1044.eurorings.net (2001:680::134:222:85:63)  6.447 ms 
> 6.494 ms  6.495 ms
>   9  adm-b5-link.telia.net (2001:2000:3080:6f::1)  6.818 ms  6.936 ms 
> 6.891 ms
> 10  ldn-b3-v6.telia.net (2001:2000:3018:5::1)  15.290 ms  27.481 ms 
> 15.380 ms
> 11  edgecast-ic-147468-ldn-b3.c.telia.net (2001:2000:3080:378::2) 
> 15.116 ms  15.174 ms  15.176 ms
> 12  2606:2800:234:1922:15a7:17bf:bb7:f09 
> (2606:2800:234:1922:15a7:17bf:bb7:f09)  15.496 ms  15.327 ms  15.460 ms

I have a clean 1500 byte path to s0.wp.com through Level3 and Telia:

 1  ge0-0-0-10.ar1.skxy.no.catchbone.net (2001:8c0:9602:1::1)  7.937 ms  7.882 ms  10.373 ms
 2  ge0-0-2.cr2.osls.as2116.net (2001:8c0:3::71)  9.745 ms  9.540 ms  9.117 ms
 3  te3-0-0.br1.osls.as2116.net (2001:8c0:3::292)  10.352 ms  9.548 ms  9.733 ms
 4  te-4-1.car1.Oslo1.Level3.net (2001:1900:5:2:1::99)  10.374 ms  9.023 ms  10.206 ms
 5  ae-3-6.bar1.Copenhagen1.Level3.net (2001:1900:5:1::49)  18.002 ms  18.597 ms  14.754 ms
 6  ae-0-10.bar1.Copenhagen2.Level3.net (2001:1900:5:1::1b6)  15.193 ms  19.215 ms  15.314 ms
 7  kbn-b3-link.telia.net (2001:2000:3080:459::1)  20.434 ms  18.480 ms  15.821 ms
 8  ldn-b3-v6.telia.net (2001:2000:3018:5::1)  41.915 ms  62.951 ms  39.543 ms
 9  edgecast-ic-147468-ldn-b3.c.telia.net (2001:2000:3080:378::2)  40.656 ms  37.063 ms  37.683 ms
10  2606:2800:234:1922:15a7:17bf:bb7:f09 (2606:2800:234:1922:15a7:17bf:bb7:f09)  39.866 ms  39.443 ms  40.827 ms

Steinar Haug, AS 2116