Why is ip_forward set to 1 when my Red Hat Enterprise Linux 5 system boots, even though I set it to zero with sysctl?

Release Found: Red Hat Enterprise Linux (RHEL) 5, 6, 7 and 8

Problem

• You have tried to set ipv4.ip_forward to "0" using /etc/sysctl.conf, but when the system boots IP forwarding is enabled.
• We are not setting sysctl's net.ipv4.conf.all.forwarding or net.ipv4.conf.default.forwarding, but somethin...