How to restore iptables rules?

To restore iptables rules, you can use the iptables-restore command. This command reads rules from a file and applies them to the iptables configuration. Here’s how you can do it:

1. Create a backup of your current iptables rules (optional but recommended):

   iptables-save > /path/to/backup/iptables.rules

2. Create a file with your desired iptables rules (e.g., rules.v4):

   *filter
   :INPUT ACCEPT [0:0]
   :FORWARD ACCEPT [0:0]
   :OUTPUT ACCEPT [0:0]
   -A INPUT -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
   -A INPUT -p tcp --dport 22 -j ACCEPT
   -A INPUT -j DROP
   COMMIT

3. Restore the iptables rules from the file:

   iptables-restore < /path/to/rules.v4

4. Verify that the rules have been applied:

   iptables -L -v

This will restore your iptables rules as specified in the file. Make sure to adjust the file paths and rules according to your needs.