30 Dec
2015
30 Dec
'15
9:15 a.m.
I'm struggling to understand what you meant when you said that the destination is the gateway. If you just mean that the traffic is NATed, then again, I was not assuming that in any of my explanations.
I said that, assuming the host with 2 public ips mentioned in the OP could be the gateway for a lan as I suspect routing based on source address that you suggested will not work for transit traffic. There's a routeback option in shorewall which probably does what the OP wants but I have no idea how to achieve this with firewalld or iptables.