====== How do you get loopback addresses other than 127.0.0.1 to work on OS X ======

1. Add localhost alias script:

<code bash>
$ sudo touch /usr/local/bin/localhost_alias
$ sudo chmod +x /usr/local/bin/localhost_alias


</code>

2. localhost_alias content:

<code bash>
#!/usr/bin/env bash

from=${1}
to=${2}

if [[ -z "$from" |]]; then
  echo "Usage: "`basename "$0"`" 2-255 2-255 [from and to range numbers (127.0.0.[from-to])]"
  exit 0
fi

for ((i=${from};i<=${to};i++))
do
    sudo ifconfig lo0 alias 127.0.0.$i up
done


</code>

3. add autorun daemon description:

<code bash>
$ sudo touch /Library/LaunchDaemons/org.localhost.alias.plist


</code>

4. org.localhost.alias.plist content:

<code bash>
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>org.localhost.alias</string>
    <key>RunAtLoad</key>
    <true/>
    <key>ProgramArguments</key>
    <array>
   <string>/usr/local/bin/localhost_alias</string>
      <string>2</string>
      <string>8</string>
    </array>
</dict>
</plist>


</code>

And we have ''127.0.0.2'' - ''127.0.0.8'' aliases at boot

*Tested on MacOS Mojave.\\
** You must allow to run ''sudo script-name'' without password in sudoers file.
<code bash>
sudo touch /private/etc/sudoers.d/localalias
sudo vi /private/etc/sudoers.d/localalias

## Added localhost alias\\
ALL ALL=NOPASSWD: /usr/local/bin/localhost_alias

sudo chmod 440 /private/etc/sudoers.d/localalias


</code>