How to add an IP address to loopback interface on Mac

Create file /Library/LaunchDaemons/yourname.plist with the following content:

<plist version="1.0">
    <dict>
        <key>Label</key>
            <string>Your Label</string>
        <key>ProgramArguments</key>
            <array>
                <string>/sbin/ifconfig</string>
                <string>lo0</string>
                <string>alias</string>
                <string>127.0.0.2</string>
                <string>netmask</string>
                <string>255.255.255.0</string>
            </array>
        <key>RunAtLoad</key>
            <true/>
    </dict>
</plist>

and reboot the machine.

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I'm a well seasoned developer, consultant and educator of web applications based mainly on Sencha libraries, PHP, MySQL and Node.js. Besides (Apple) computers, I love photography and mountain biking.

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