Smart DNS / Proxy Setup Script

This script will setup a smartdns server and proxy to allow restricted traffic to work from the designated IPs

Linode Setup

From the Linode control panel (https://cloud.linode.com/linodes/create), create a new Linode:

• For OS, choose CentOS9
• For region, choose something like Paris (close location and allows the restricted traffic)
• For Linode Plan, choose Shared CPU -> Nanode 1 GB

Script Setup

SSH into the Linode and copy setup.sh to somewhere.

cd /root
nano setup.sh

Paste in the setup.sh file contents. Save the file, updating the IP address to your own IP address, or all to allow all traffic (not recommended!) Then give it permissions to run, and run it.

chmod setup.sh 755
./setup.sh

If you make changes to the file (eg. add a new IP address). The setup.sh file can just be re-run.

Maintenance

Add IP's to firewall From command line

firewall-cmd --zone=smartdns --add-source=<IP>
firewall-cmd --reload

Remove IP's from firewall From command line

firewall-cmd --zone=smartdns --remove-source=<IP>
firewall-cmd --reload

Using the Smart DNS Server

Update your router/device/application DNS Server to the IP address of the Linode Instance, ideally limiting the traffic to only what you need (e.g. by Domain Name - In pfSense this is under Services>DNS Resolver>Domain Overrides)

** Note that its not just a DNS server but also a proxy, meaning you will be charged for bandwidth used **