sysctl is an interface that allows you to make changes to a running Linux kernel. With /etc/sysctl.conf you can configure various Linux networking and system settings such as:
Limit network-transmitted configuration for IPv4
Limit network-transmitted configuration for IPv6
Turn on execshield protection
Prevent against the common ‘syn flood attack’
Turn on source IP address verification
Prevents a cracker from using a spoofing attack against the IP address of the server.
Logs several types of suspicious packets, such as spoofed packets, source-routed packets, and redirects.
Harden the system using sysctl
View sysctl values