Thanks @TheCat12 for the reply.
Who is 104.152.52.24 or 3.17.141.240? Why it generating traffic from in side to out?
I guess first I save my config on both routers & update to v7 and hope IPSEC will work as usual without hiccups. Is ir possible to reverse back yo V6 if any thing goes wrong?
for RB750Gr3 based on this http://forum.mikrotik.com/t/back-to-home-supported-router/171813/1 - BTH vpn not possible id behind CGNAT?