MTU issues s0.wp.com

Tue Nov 6 14:11:49 UTC 2012

On 2012-11-06 13:33, 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.

tracepath and scapy are the tools of choice here to determine where pMTU
messages go missing. Also, it would be very useful to have a source
address when reporting these issues as it might affect a lot of other
paths too.

Greets,
 Jeroen