![]() ![]() Ip6tables -I INPUT -m set -match-set blacklist6 src -j DROPīeen using ipset for years. Ipset create blacklist6 hash:net hashsize 4096 family inet6 If you want to use IPv6 addresses, create the related database with the ‘inet6’ family. sbin/ipset -file /etc/iptables/ipset save Combining ipset and IPv6 You may need to create the /etc/iptables/ipset file. This script helps to save and restore the ipset rules. ![]() To also store ipset rules, create a small systemd service file: /etc/systemd/system/rviceĭescription=ipset persistent rule serviceĬonditionFileNotEmpty=/etc/iptables/ipsetĮxecStart=/sbin/ipset -exist -file /etc/iptables/ipset restoreĮxecStop=/sbin/ipset -file /etc/iptables/ipset save As the name implies, this makes the iptables rules persistent across reboots. To save and restore iptables rules, use the package iptables-persistent. Also, make sure it still works after a reboot of the system. You want to be sure that the blacklist is enforced in your specific configuration. When setting up a blacklist like this, always test it. In this screenshot, we can see the IP address is listed as a member of the set. To confirm the blacklist contains the IP address, use the ipset list command. Ipset add blacklist 192.168.1.100 Show details Next step is adding actual IP address to the list: # Add a specific IP address to your newly created blacklist No output will be displayed when entering the commands. As this is a blacklist, the related policy is to drop traffic. These commands will add the blacklist (or set) to the INPUT and FORWARD chains. Iptables -I FORWARD -m set -match-set blacklist src -j DROP Iptables -I INPUT -m set -match-set blacklist src -j DROP Note: if you want to block based on networks, use hash:net.Īfter the blacklist is created, we can use the set in iptables. Ipset create blacklist hash:ip hashsize 4096 # Create blacklist with ipset utility (once) We name it blacklist to show clearly its purpose. With the newly installed ipset utility we create a new list to block IP addresses. Debian and UbuntuĪpt-get install ipset Creating a blacklist You may need to install the epel-release package first. Most Linux systems do not have the ipset utility installed by default. This way we can add multiple systems we no longer want to connect to our systems. Using blacklists with iptables and ipsetĪnother option is creating a blacklist. You might even get a very long list of IP addresses to block after a while. Iptables -I INPUT -s 192.168.1.100 -j DROPĪlthough this option works great, it might not scale very well. This way traffic is no longer allowed from that particular IP address. The first option to permanently block an IP address is by creating a rule in the INPUT chain. ![]() We will use an empty ruleset for test purposes. The first step is to validate existing iptables rules. Time to get started and block some IP addresses! Check existing iptables configuration This may come in handy when you get repeating port scans or see failed login attempts in your log files. We can use iptables to block one, multiple IP addresses, or even full networks. It is around for quite a while and is enabled by default within the Linux kernel. Most system administrators will already be familiar with iptables. Blocking IP addresses and subnets with ipset ![]()
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