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Unix HowTo: Start / Stop / Restart Network Service Command

How do I start, stop, or restart networking service under HP-UX, OpenBSD, AIX and other Unix like operating systems?
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CentOS / Red Hat Linux IP Forwarding How To

How do I enable IP forwarding under RHEL / Red Hat / Fedora / CentOS Linux operating systems?
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How To Set Caching DNS Server

Q. How do I set caching dns server to speed up dns lookup for my LAN (500 PC)? The DNS lookups creating a lot of network activity. There are a few times when this causes performance issues. How do I configure caching dns under Debian Linux?
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Linux Disable X Window System

Q. How do I disable X Window system on boot? I just need text based interface and there is no need to waste resources on X window system. How do I disable X Window under CentOS / RHEL / Red Hat / Fedora Linux?
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Red hat / Fedora / CentOS Yum Repo is Listed More Than Once

Q. Why does my yum command fail with an error that a repo is listed more than once under Fedora / RHEL / CentOS Linux? This error occurs when I type yum clean command

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Repository xen-repo is listed more than once in the configuration

How do I fix this problem?

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Linux command to remove virtual interfaces or network aliases

Q. How do I remove virtual interfaces such as eth0:1 or eth1:1?
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