![]() ![]() ![]() The above command will dump the current iptables rule set into /etc/nf. In order to run iptables automatically after reboot on Debian, do the following.įirst, customize iptables as you wish, and then save the current iptables rule-set using iptables-save command as follows. On Debian, any script that is marked as executable and placed in /etc/network/if-up.d gets executed when a network interface is brought up. If you have customized iptables rules, and would like to load the customized iptables rules persistently across reboots on Debian, you can leverage the if-up.d scripts that are located in /etc/network/if-up.d. On the other hand a "managed" VPS may have additional protections, when it is geared toward less technically proficient end users.How to run iptables automatically after reboot on Debian I am assuming you have an "unmanaged" VPS, which means you are on your own and you have to protect yourself. Upstream traffic filtering should be minimal if any, but it is something you have to clarify with the webhost. So the fact that iptables is present does not necessarily mean it is the active firewall.Īnd since you mention it is a VPS: in addition to the built-in Linux firewall, the VPS may be sitting behind a hardware/software appliance of some sort, that acts as firewall or does DDOS mitigation. For example it is possible that someone replaced the default firewall with another firewall (firewalld, ufw) but that iptables is still installed. Which means that while it's not running it is available. ![]() If a firewall is already installed, chances are it's one of those: iptables, firewalld, ufw.Īttention: a service may be installed on your system but disabled. To list active services: systemctl list-units -type=service -state=active To list all loaded services on your system, including failed services: systemctl -type=service It is a good idea to review the default setup, because there may be services that you don't need, and you can disable them to improve performance, even reduce the attack surface (for example there may be a webserver running, that you don't need). I would have a look at the system services. ![]()
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