so refercing the above screenshot of the docker host... something like... Edit /etc/sysctl.conf to uncomment net.ipv4.ip_forward.

sudo sysctl -w net.ipv4.ip_forward=1
PHY_IFACE=ens3; NM_IFACE=netmaker
sudo iptables -t nat -A POSTROUTING -o $PHY_IFACE -j MASQUERADE
sudo iptables -A FORWARD -i $PHY_IFACE -o $NM_IFACE -m state --state RELATED,ESTABLISHED -j ACCEPT
sudo iptables -A FORWARD -i $NM_IFACE -o $PHY_IFACE -j ACCEPT
sudo apt install iptables-persistent
sudo bash -c iptables-save > /etc/iptables/rules.v4