I am running netmaker 0.16 under ubuntu 22.04 here is PostUp & PostDown content. PostUp =

iptables -A FORWARD -i nm-wg-jp1-vpn -j ACCEPT ; iptables -A FORWARD -o nm-wg-jp1-vpn -j ACCEPT ; iptables -t nat -A POSTROUTING -o nm-wg-jp1-vpn -j MASQUERADE ;  ; iptables -A FORWARD -i nm-wg-jp1-vpn -j ACCEPT ; iptables -A FORWARD -o nm-wg-jp1-vpn -j ACCEPT ; iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE ;

PostDown =

iptables -D FORWARD -i nm-wg-jp1-vpn -j ACCEPT ; iptables -D FORWARD -o nm-wg-jp1-vpn -j ACCEPT ; iptables -t nat -D POSTROUTING -o nm-wg-jp1-vpn -j MASQUERADE ;  ; iptables -D FORWARD -i nm-wg-jp1-vpn -j ACCEPT ; iptables -D FORWARD -o nm-wg-jp1-vpn -j ACCEPT ; iptables -t nat -D POSTROUTING -o eth0 -j MASQUERADE ;