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MTU issues s0.wp.com



On Nov 6, 2012, at 4:33 AM, Seth Mos wrote:

> Hi,
> 
> Since about a week or so it's become impossible to reach wp.com content over IPv6.
> 
> IPv4 content does work fine, using the IPv6 literal returns a 404 which is small enough to fit in a smaller 1480 byte MTU.
> 
> I have another test site that has a clean 1500 byte mtu and I can fetch the s0.wp.com page from there.
> 
> It looks like tunneled IPv6 users might be in hurt here.
> 
> Is anyone else experiencing similar issues?
> 
> 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
> 
> Kind regards,
> 
> Seth
> 

Exact same issue here over HE.net tunnel. I can get errors from the (presumably) front-end proxy, but content stalls forever. I'm seeing this for all WP related requests that go to EdgecastCDN.

--
chort