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.

I tried to contact someone at 1&1 and told their customer to pass the message, 
but nobody responded.

Anyone in the list is working for 1&1 or has the right contact?


IPv4 is over
Are you ready for the new Internet ?
The IPv6 Company

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