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Linux security tutorials

Defend Your Web Server Against Distributed Denial of Services (DDos) Attacks

Contributed by qmchenry on July 8, 2008 under Linux security

In computer security, it quickly becomes apparent that preventing computer attacks is much more challenging than attacking computers. A good example of an easy technique to prevent a website from functioning is a distributed denial of service, or DDoS, attack in which a number of compromised computers around the internet make web (or other protocol) requests on some poor server. If the web page requested is one that requires lots of server-side processing, the resulting load from the combined requests prevents the web server from responding to legitimate requests, thus denying the service. As Tech-Recipes.com was subjected to such an attack recently, we felt it might be beneficial to others if we described the steps we took in our response.

Apache-Website Security

Contributed by lvance on February 27, 2004 under Linux security

Simple clear Security for Websites running on Apache. This can be on any flavor of Unix

Make Linux ignore a ping

Contributed by skreuzer on October 18, 2003 under Linux security

Sometimes it can be useful to hide a Linux machine a bit.

Hide your BIND version

Contributed by skreuzer on under Linux security

Any user can discover the version of bind you are running with the following command: nslookup -q=txt -class=CHAOS version.bin.remote.dns.server