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Why is 'net.ipv4.ip_forward' enabled on boot with disabling it in sysctl in Red Hat Enterprise Linux 6

Solution Verified - Updated 2017-09-26T02:45:45+00:00 -

Issue

We are disabling net.ipv4.ip_forward on /etc/sysctl.conf on a Red Hat Enterprise Linux 6 machine.
But, we saw it's enabled after system boot.
Why was it enabled on boot?

Environment

Red Hat Enterprise Linux 6

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