De /usr/share/doc/initscripts-8.45.7/sysconfig.txt
obsoleted values from earlier releases:
FORWARD_IPV4=yes|no
This setting has been moved into net.ipv4.ip_forward setting
in /etc/sysctl.conf. Setting it to 1 there enables IP forwarding,
setting it to 0 disables it (which is the default for RFC compliance).
Tobias