Comment # 27 on bug 1135647 from andreas bittner

and I do NEED ipv4 forwarding (NAT translation) to from its secondary
networking interface, and I (currently) only need ipv6 functionality on its
main ethernet interface where it is connected to the outside network.

this worked perfectly fine in the past opensuse leap and before versions. I was
able to happily nat/ipv4 route to/from multiple ethernet interfaces regardless
of ipv6 functionality.

these two stacks and protocols didnt interfere with another. seemingly there is
something seriously wrong here that an ipv4 routing/nating functionality would
hinder or completely disable ipv6 simple public unicast ipv6 assignment by RA
via the provider/upstream router etc.

why?