Cloudflare (AS13335) broken - only on IPv6?

[ignatios at cs.uni-bonn.de]

Hi,

we've got reports that 

- repo.anaconda.com (104.17.N.77, 2606:4700::ip.v4.adr.ess)

(and later:
- www.zabbix.com (104.24.10[23].152, 2606:4700:30::6818:6[6]98)
- www.thunderbird.net (104.25.17[45].13, 2606:4700:20::6819:a[ef]0d)

"don't work but work when IPv6 is switched off"

Careful scrutinizing revealed that this was only the case for one
or two of the used address group.

Detailed symptom: TCP opens, but the first data segment written
gets a RST back.

I first reported to anaconda.com, but it seems to be a generic
problem to me now (who else is seeing this?)

So, if any colleague @ cloudflare (AS13335) reads this: 
please make work again.

	-is
-- 
Ignatios Souvatzis, Chief IPv6 enabler		RFC 6540
Gemeinsame Systemgruppe b-it + Informatik	Tel. +49 228 73-60701
gsg at cs.uni-bonn.de