How to set up routing on a server under CentOS 7?

Question

linux

Good day!
I set up a home server according to this article
. However, something went wrong. Started from scratch.
Given:
CentOS7-minimal,
Dell Dimension 4300 with two network cards:
eth1(192.168.0.203) - "looks" at the provider's side;
eth0(192.168.1.200) - "looks" into the local network.
How to set up routing on the server so that the local network, having an eth0 gateway, gains access to the world?

Answer 1

You also need to know the address of the gateway (router) on the provider's side.
1. Enable routing:
- temporary option until reboot: from the command line echo 1 > /proc/sys/net/ipv4/ip_forward (naturally under root or with sudo)
- permanent option: add the line to the /etc/sysctl.conf file net.ipv4.ip_forward = 1 and reload or command sysctl -p
2. Specify default route: route add default gw <provider gateway address>

Answer 2

For some reason, forwarding was not applied to all interfaces (net.ipv4.ip_firwarding=1)
True, I configured the grid through systemd-networkd.
Forced the IPForwarding=yes
man systemd.network option for each interface to help