Everything a novice could need
>I recently decided to take the tests towards the Red Hat Certified
Engineer (RHCE) diploma. It was partly my decision, and partly my
company\’s decision. In any case, no matter what, I had to prepare for
the test to maximize my chances and in order to do so I needed to
put together some documentation in the [...]
A typical problem that we Linux users have to solve is how to connect to our Linux box via ssh from a Windows system. You see this question posted over and over again in the newsgroups and mailing lists. Well, here is a list of Windows ssh clients [...]
In order to increase the security of the system, you may want to limit which ttys will allow root to log in. This information is kept in the /etc/securetty file.
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Crackers resort to several methods of spoofing source IP addresses as a way to get information about hosts. However, you can configure Linux to automatically block these IP addresses by echping the number 2 to each rp_filter name found in the /proc file system:
echo \”2\” > /proc/sys/net/ipv4/conf/*/rp_filter
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Sometimes, it may be necessary to disable shell access to a certain user even though we still want them to access mail services for instance. Just make sure you change the shell for that user in /etc/passwd or /etc/shadow to be /bin/false, and then add /bin/false to the /etc/shells [...]