How to save/backup existing iptables rules to a fileģ. If you want to remove the 8th line, use -D switch and specify the line number.Ģ. IPTable command to list all rules with line number: iptables -L -n -line-numberĮxample: # iptables -L -n -line-number In this case we can remove that particular line by using the switch “D” after found that line number using “–line-number” switch. It’s very useful if your iptables has a lot of rules. Syntax: iptables -D INPUT -s IP-ADD -j DROPĮxample: iptables -D INPUT -s xx.xxx.xx.xx -j DROP Switch to remove an iptables rule: -D : Delete a rule So, we need to remove that rule from INPUT chain. By-default the iptables execute rules from top to bottom. But, if the IP address is already blocked in your server firewall, the allowing method using “ACCEPT” as target will not work.īecause, we have already added one rule for this IP to block. You can allow IP address by changing the target to ACCEPT (iptables -A INPUT -s IP-ADD -j ACCEPT). How can I unblock IP address from block-list ? Where port 25 will be blocke for that particular IP address. Syntax: iptables -A INPUT -s IP-ADD -p tcp -destination-port portnumber -j DROPĮxample: iptables -A INPUT -s xx.xx.xx.xx -p tcp -destination-port 25 -j DROP Additional switches required -p : To specify protocol We can simply manage this from command-line using the iptables command. Yes, in some situations we have to block some ports to a particular IP address. How can I block a particular PORT for a particular IP on your Linux server ? Then save the newly added rules to iptables. Where xx.xx.xx.xx is the IP address which you want to block. Syntax: iptables -A INPUT -s IP-ADD -j DROPĮxample: iptables -A INPUT -s xx.xx.xx.xx -j DROP
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