Conventions

In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "Modify /etc/default/isc-dhcp-server to add the interface which you should serve requests on."

A block of code is set as follows:

auto eth0
iface eth0 inet static
    address 10.0.0.1
    netmask 255.255.255.0

Any command-line input or output is written as follows:

# ip link set dev eth0 up
# ip link show eth0

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "Under User Functions, click Create Regular Tunnel. You may create up to 5 tunnels."