fedora enable ipv4 forwarding

taken from here

To configure a CentOS or Fedora Linux host to forward IPv4 traffic, you can set the “net.ipv4.ip_forward” sysctl to 1 in /etc/sysctl.conf:

net.ipv4.ip_forward = 1

Once the sysctl is added to /etc/sysctl.conf, you can enable it by running sysctl with the “-w” (change a specific sysctl value) option:

$ /sbin/sysctl -w net.ipv4.ip_forward=1
net.ipv4.ip_forward = 1

If routing is configured correctly on the router, packets should start flowing between the interfaces on the server. Nice!