Add lo0 Aliases

/usr/local/bin/lo0-aliases.sh

#!/bin/bash

IPS=(
    "10.24.1.1"
    "10.24.1.2"
)

for ip in "${IPS[@]}"; do
    /sbin/ifconfig lo0 alias "$ip" netmask 255.255.255.255
    echo "Added alias: $ip"
done

echo "All IP aliases added successfully"

chmod a+x /usr/local/bin/lo0-aliases.sh

/Library/LaunchDaemons/local.lo0-aliases.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>local.lo0-aliases</string>

    <key>ProgramArguments</key>
    <array>
        <string>/usr/local/bin/lo0-aliases.sh</string>
    </array>

    <key>RunAtLoad</key>
    <true/>

    <key>StandardOutPath</key>
    <string>/tmp/lo0-aliases.log</string>

    <key>StandardErrorPath</key>
    <string>/tmp/lo0-aliases.err</string>
</dict>
</plist>

chown root:wheel /Library/LaunchDaemons/local.lo0-aliases.plist
chmod 644 /Library/LaunchDaemons/local.lo0-aliases.plist

launchctl load /Library/LaunchDaemons/local.lo0-aliases.plist

launchctl unload /Library/LaunchDaemons/local.lo0-alias.plist

cat /tmp/lo0-alias.log

cat /tmp/lo0-alias.err