Create a simple gateway server by setting masquerade with firewall-cmd of CentOS8

Constitution

Internet --- eth0-Gateway server -eth1 --- Some server

Check the zone

# firewall-cmd --get-active-zone
public
  interfaces: eth0 eth1

Change zone

# nmcli connection modify eth1 connection.zone internal
# nmcli connection modify eth0 connection.zone external

Check the zone

# firewall-cmd --get-active-zone
external
  interfaces: eth0
internal
  interfaces: eth1

By the way, this is automatically enabled

--Isn't it changed with iptables?

#  cat /proc/sys/net/ipv4/ip_forward
1

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