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# Tested on RHEL 6 & 7
# On RHEL 7, default settings are in /usr/lib/sysctl.d/00-system.conf. These default# Setting kernel parameters is a fairly straightforward task. If we check the file # /etc/sysctl.conf, we will see several attributes with their appropriate values, these are # the values applied at startup. This file can be edited directly with a text editor, then # the values reloaded by executing 'sysctl -p'. # settings may be overridden by entering new settings in /etc/sysctl.conf or in an # /etc/sysctl.d/<name>.conf file. # These values can also be changed at runtime by modifying the values under /proc/sys. # For instance, attribute named net.ipv4.ip_forward can be viewed or modified as # /proc/sys/net/ipv4/ip_forward. # To view the running value, run: cat /proc/sys/net/ipv4/ip_forward # To change the running value, run: echo 1 > /proc/sys/net/ipv4/ip_forward # The kernel attributes and values available to change can be found by either browsing the # /proc/sys folders, or by running 'sysctl -a': /sbin/sysctl -a | grep net.ipv4.ip_forward # Lastly, values can be hot modified by running 'sysctl -w' command: /sbin/sysctl -w net.ipv4.ip_forward=0 # To fix this change, insert a new line with the parameter in file /etc/sysctl.conf. # Load in settings from the file specified or /etc/sysctl.conf if none given:
/sbin/sysctl -p [/etc/sysctl.conf] |