nat server-centos 8

 [root@w242 ~]# firewall-cmd --get-active-zone

external

  interfaces: ens18

internal

  interfaces: ens20

[root@w242 ~]# firewall-cmd --reload

success

[root@w242 ~]# cat /proc/sys/net/ipv4/ip_forward

1

[root@w242 ~]# firewall-cmd --reload

success

[root@w242 ~]#