To Modify the Kernel Parameters

$ sudo sysctl -w parameter=value

To enable IPv4 packet forwarding

$ sudo sysctl -w net.ipv4.ip_forward=1

To set a parameter permanently

$ sudo sysctl -w net.ipv4.ip_forward=1 >> /etc/sysctl.conf

To read values from file

$ sudo sysctl -p /etc/sysctl.d/file_name.conf

To print variable names without values

$ sudo sysctl -N vm.swappiness

To print values only of the given variable

$ sudo sysctl -n vm.swappiness

To read values from all system directories

$ sudo sysctl --system

To print version and help options

$ sudo sysctl --version

$ sudo sysctl --help

regards,

T.Dhanasekar