Route Host Traffic over Additional Public IP Adress

Hello,

i run Astaro 8.301 and i would need all traffic of a host in my internal net to be routet through a addinational wan ip. I aready set up the additional wan ip and have dnat running to forward all required services from the additional ip to the host.
But how do i achieve that the traffic from the host (video conference system) is going out through the secondary external ip?

best regards