Many options can be used with the iptables command. Use Linux iptables to Manage IPv4 Traffic The iptables Command In order to use iptables, you will need root ( sudo) privileges. Iptables will not save rules after restarting your server so you must either save a copy of your current rules before restarting your server or install a package called iptables-persistent which will automatically reload any saved iptables rules upon server restart.By default, the iptables tool is included with your Linode-supplied distribution. How to save iptables rules for reuse after restarting your server: #iptables -I INPUT X -p tcp -dport 80 -j ACCEPT Below is an example of adding an allow rule for port 80 into line X. Notice that the -I for insert rather than -A for append is being used. Next, use one of the above commands while replacing the letter X with the line number you would like to insert the rule in to. How to add a rule at a specific line in iptables:įirst run the following command to see the line numbers so you can more easily tell where you should insert your rule. Replace 111.111.111.111 with the IP of your choosing: The following rule will append a block/deny rule for a specific IP address through IP tables. #iptables -A INPUT -p tcp -dport 80 -j DROP

How to append a block/deny rule into iptables: The following rule will append an allow rule for a specific IP address through IP tables. #iptables -A INPUT -p tcp -dport 80 -j ACCEPT How to append an allow rule into iptables:

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