I figured I would write this for those who didnt want to use the pre patched tarball or just wanna learn to do it yourself.
First
cd /usr/src
wget http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.21.3.tar.gz
tar zxvf linux-2.6.21.3.tar.gz
rm -rf linux
ln -s linux-2.6.21.3 linux
wget http://grsecurity.net/grsecurity-2.1.9-2.6.19.1-200612121859.patch.gz
gunzip < grsecurity-2.1.9-2.6.19.1-200612121859.patch.gz | patch -p0
cd linux
Do make menuconfig to set al your options, If you are copying over a current [...]

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I got tired of waiting on the next offical release of grsecurity as the current one now is from January so I decided to run one of the testing patches. I also seen a lot of new features in the latest kernel I was wanting to try. I have this source configured for a core2duo [...]

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Well first off this will only stop http or connect floods if you are having a real ddos problem you should be on a protected network otherwise there isnt much you can do server level if the attacks are pretty big. Using this method in combination with a protected network is [...]

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