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4.7.2. Synchronizing sysctl
The sysctl file is only modified once in most situations. This file is read at boot time and tells the kernel to turn on packet forwarding.
Important
If you are not sure whether or not packet forwarding is enabled in the kernel, see Section 2.5, “Turning on Packet Forwarding” for instructions on how to check and, if necessary, enable this key functionality.
