NAT translation from BSD to CentOS 7 with Firewalld

[PsychoFish]

On a BSD system we have a NAT configured as :

in /etc/ipn.conf

map em0 <remote branch IP range>/23 -> <IP address in local branch range>/32

I'm trying to replicate that on CentOS with direct rules

firewall-cmd --permanent --direct --passthrough ipv4 -t nat -I POSTROUTING -o eth0 -j DNAT -s <remote range>/23 -d <LOCAL IP>/32

Is this the right way to do it, or is there another way I should be doing this?

[aks]

firewall-cmd --zone=<zone_name_like_external> --add-masquerade
See http://www.certdepot.net/rhel7-get-started-firewalld/