I was looking at these articles, there are few variances http://joshrendek.com/2013/01/securing-ubuntu/#sysctl -- taken from NSA recommendations http://www.cyberciti.biz/faq/linux-kernel-etcsysctl-conf-security-hardening/ -- great linux site in general I've found I created a gist/diff to see the differences, some were just adding comments. Some good definitions are here: http://wwwx.cs.unc.edu/~sparkst/howto/network_tuning.php but I'm no linux guru at this level of networking https://gist.github.com/rschmitty/5875625/revisions Which setting should I use for a web server?