Each table contains zero or more simple rules where the IP address or specific properties of a packet are checked. Network packets entering or leaving a networked Linux computer pass a number of tables in the kernel. Because most people will only use the iptables program, it is often referred to as the Linux firewall and we will do it here also for convenience. The real firewall is present in the kernel. The iptables program is a front-end which can be called from the command line to alter filter tables in the kernel. To be honest we have to say that iptables is not the firewall itself. Iptables is a software solution which is available on most Linux computers with a kernel version 2.4 or newer. It happened to me in the past, even with 10+ years experience on Unix/Linux security and firewall configuration. In case you lockout yourself during testing, a reboot will be enough to get access again. While testing you should always keep a backdoor open, for example by making the firewall not startable when booting. You should understand that it is just as easy to block enemies, as it is to block your own access. This page describes a way to implement a firewall in the kernel of your computer. ![]() Firewalls can be either implemented in existing network devices like routers, as separate devices with the sole function to protect a network or in the first layers of the networking stack on a networked computer.įirewalls can be very effective in blocking undesirable traffic to your computer or network. ![]() Adding and removing enemies from the firewallĪ firewall in IT terms is a software or hardware solution which tries to block as much as possible evil network traffic, while allowing useful traffic.
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