First, we are going to install some software that we will use later
in the manual.
apt-get install openssh-server nano dnsutils bsd-mailx telnet
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SSH server will allow us to connect remotely to the server.
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Nano is a text editor. More user friendly than vi.
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We will use wget to fetch stuff from the internet.
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dnsutils package will allow us to troubleshoot possible DNS problems on our system.
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Telnet and bsd-mailx will be used later for troubleshooting our setup.