Turning Your Home Computer into a Home Server You Can Access Remotely

For years, I used my desktop and Mac mini at home just like everyone else, as personal machines tied to my home Wi-Fi. The problem came when I wanted to access them while I was away. I could leave files or a running script behind, but there was no easy way to log back in remotely.

That is when I realized: with a little setup, your home computer can become your own home server, accessible from anywhere in the world. The trick is Dynamic DNS (DDNS).

The Problem: Your IP Address Keeps Changing

At home, your computer gets a private IP from your router (for example, 192.168.1.100). That works fine while you are on the same Wi-Fi, but it is useless when you are away.

You could try connecting to your home’s public IP (for example, 203.0.113.25), but that number often changes whenever your modem or router restarts.

That is why DDNS exists.

The Solution: Dynamic DNS

Dynamic DNS services give you a permanent hostname (for example, example.dynu.net) that always points to your current home IP. When your ISP changes your IP, a small script automatically updates the DDNS provider. You no longer need to remember the numeric public IP.

Step 1: Choose a DDNS Provider

Popular options include:

• Dynu: free and reliable, with paid extras.
• No-IP: well known, free tier requires monthly confirmation.
• DuckDNS: simple and free.
• Cloudflare DDNS: excellent if you own your own domain.

For this walkthrough, I use Dynu, but the workflow is similar for other providers.

Step 2: Create a Hostname

1. Sign up at dynu.com.
2. Go to DDNS Services and click Add.
3. Pick a hostname, for example example.dynu.net.
4. Save.

Test it:

dig +short example.dynu.net

You should see your current public IP.

Step 3: Generate an IP Update Password

In your Dynu account, set an IP Update Password. This is safer to use in scripts than your main account password.

Step 4: Write the Update Script

On your home computer, create ~/dynu/update.sh:

#!/bin/bash
USER="your-dynu-username"
PASS="your-ip-update-password"
HOST="example.dynu.net"

WAN_IP=$(curl -4 -s ifconfig.co)
RESP=$(curl -s -u "$USER:$PASS" \
  "https://api.dynu.com/nic/update?hostname=$HOST&myip=$WAN_IP")

echo "$(date): $RESP" >> ~/dynu/dynu.log

Make it executable:

chmod +x ~/dynu/update.sh

Test it:

~/dynu/update.sh

You should see either:

• good <ip> (updated), or
• nochg <ip> (no change).

Step 5: Automate the Updates

Run the update script automatically every 30 minutes.

macOS (LaunchDaemon)

Save this as /Library/LaunchDaemons/org.ddns.update.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>org.ddns.update</string>
  <key>ProgramArguments</key>
  <array>
    <string>/bin/bash</string>
    <string>/Users/yourname/dynu/update.sh</string>
  </array>
  <key>StartInterval</key><integer>1800</integer>
  <key>RunAtLoad</key><true/>
  <key>UserName</key><string>yourname</string>
  <key>StandardOutPath</key><string>/Users/yourname/dynu/dynu.log</string>
  <key>StandardErrorPath</key><string>/Users/yourname/dynu/dynu-error.log</string>
</dict>
</plist>

Enable it:

sudo launchctl bootstrap system /Library/LaunchDaemons/org.ddns.update.plist
sudo launchctl enable system/org.ddns.update
sudo launchctl kickstart -k system/org.ddns.update

Linux (cron)

Add this to your crontab (crontab -e):

*/30 * * * * /home/yourname/dynu/update.sh

Step 6: Configure Port Forwarding

To reach your computer from outside your home network, configure your router to forward traffic to your machine:

• Reserve the computer’s internal IP (for example, 192.168.1.100).
• Forward a port (for example, external 2222 to internal 22 for SSH).

Step 7: Connect Remotely

From anywhere:

ssh -p 2222 user@example.dynu.net

Security Tips

• Use SSH keys instead of passwords.
• Change SSH from port 22 to a higher custom port.
• Keep your system updated.
• Optionally combine this with a VPN for another security layer.

Conclusion

With a free DDNS account, a simple update script, and one router port-forwarding rule, you can turn a desktop, laptop, Mac mini, Linux box, or Raspberry Pi into a reliable home server.

You connect with a hostname like example.dynu.net, even if your ISP changes your public IP regularly.