Enable IP spoofing protection

Securing and Optimizing Linux: RedHat Edition -A Hands on Guide
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# 5.31. Enable IP spoofing protection

The spoofing protection prevents your network from being the source of spoofed i.e. forged communications that are often used in DoS attacks.

                  [root@deep] /# for f in /proc/sys/net/ipv4/conf/*/rp_filter; do
                  > echo 1 > $f
                  > done

                  [root@deep] /#

Add the above commands to the `/etc/rc.d/rc.local` script file and you'll not have to type it again the next time you reboot your system.

Edit the `/etc/sysctl.conf` file and add the following line:

                  # Enable IP spoofing protection, turn on Source Address Verification
                  net.ipv4.conf.all.rp_filter = 1

You must restart your network for the change to take effect. The command to manually restart the network is the following:

                  [root@deep] /# /etc/rc.d/init.d/network restart
                  Setting network parameters	[  OK  ]
                  Bringing up interface lo		[  OK  ]
                  Bringing up interface eth0	[  OK  ]
                  Bringing up interface eth1	[  OK  ]

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