On Tue, Sep 13, 2016 at 8:26 AM, <aleksey.maksimov@it-kb.ru> wrote:
2604:1580:fe02:2::10

Probably yum/DNF not explicitly asking for IPv4 (and perhaps happy eyeballs[1] is used on the stack?)
Y.

[1] https://en.wikipedia.org/wiki/Happy_Eyeballs