14 okt. 2016 kl. 12:38 skrev Kurt Jaeger 
<ipv6-...@c0mplx.org<mailto:ipv6-...@c0mplx.org>>:

Hi!

I've discovered, several months ago already, that all the 1&1 web sites
with IPv6 support enabled are broken, because they filter PMTUD, so any
residential customer with has a reduced MTU because PPP or any other
encapsulation/tunnel, etc., is not reaching them.

Do you have an example of a website they host that I can test against?

www.corso-kino.de<http://www.corso-kino.de>

Yes, it fails PTB test

https://ipv6alizer.se?address=http://www.corso-kino.de

/Tobbe



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       4 years to go !


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