Keeping ebtables Rules After a Reboot

1. Make sure the iptables-persistent package is installed on your system. If it is not, install it with the following command (for Debian/Ubuntu):

   sudo apt-get install iptables-persistent

   or for RHEL/CentOS/Fedora:

   sudo yum install iptables-services

2. Create the /etc/ebtables directory if it does not exist yet:

   sudo mkdir -p /etc/ebtables

3. Create a rules file in the /etc/ebtables directory:

   sudo touch /etc/ebtables/rules

4. Save the current ebtables rules to the file:

   sudo ebtables-save > /etc/ebtables/rules

5. Create a new systemd service file (for example, /etc/systemd/system/ebtables.service) with the following contents:

   [Unit]
   Description=Ebtables rules loader
   After=network.target
   
   [Service]
   Type=oneshot
   ExecStart=/sbin/ebtables-restore /etc/ebtables/rules
   RemainAfterExit=yes
   
   [Install]
   WantedBy=multi-user.target

6. Reload the systemd configuration and enable the new service:

   sudo systemctl daemon-reload
   sudo systemctl enable ebtables.service

7. Check that the service works correctly by starting it manually:

   sudo systemctl start ebtables.service