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When you add many rules, you can better get track of them by viewing their numbers. You can get numbers by following command:. If you want to delete rule number 3 as well, don't use number 3, as deletion of number two have shifted numbers. Instead, you do status numbered command again and check new numbers.

Instead you can delete just using rule itself as below. You will see all actions of firewall in that file. If you need to reload firewall for some reason, because you changed some config files manually, use following command. For most scenarios, you can use terminal commands, but in some cases you would want to edit config files directly. The ufw have multiple config files, namely:. Those two files hold rules that are evaluated before all rules that you added by ufw commands.

So if you want some rule to be applied first, you want it there. First file is for ipv4 and second one is for v6. These are evaluated after ufw command rules. They are good to use if you want to override some rule and have it applied no matter what. Again, two files, for two versions of IP protocol that are currently used. Here we have kernel modules that ufw uses, as well as other general settings.

You can edit any of this config files only as root, and you can use any text editor you like. Note that command without protocol like above, opens both udp and tcp port. So let's run the same command again to see what happens. It doesn't allow us to add duplicate rule. That is good, but there is still chance we can add duplicate rule, by this series of commands:. After allowing both tcp and udp on port we can still add open port for all protocols and this is duplicate rule as port is opened twice, once for each protocol and once for all of them.

This leaves room for error and it generally it is not a good practice. We need to undo all three commands with ufw delete command if we want to return for default for port The latter command will block incoming packets from IP address from the range of Sometimes the packets are not for the consumption of the host itself but for some other system and in those cases we use another keyword route followed by allow or deny.

This fits nicely with the specification of interface names in ufw rules as well. Although you can use interface names like ufw allow 22 on eth0 independently, the picture fits together quite well when we use route along with it.

The above rule, for example, forwards incoming requests from eth0 ethernet interface to a virtual interface docker0 for your docker containers. Now your host system has an extra layer of isolation from the outer world and only your containers deal with the dangers of listening on incoming requests. Of course, the main use for packet forwarding is not to forward packets internally to the containers but to other hosts inside a subnet.

Sometimes the sender needs to know that the packet was rejected at the firewall and ufw reject does exactly that. In addition to denying the packet to go forward to its destination, the ufw reject also returns an error packet back to the sender saying that packet was denied. This is useful for diagnosis purposes as it can tell the sender directly the reason behind the dropped packets.

When implementing rules for large networks it is easy to block off the wrong port and using reject can tell you when that has happened. The above discussion revolved around the syntax of the Firewall but the implementation would depend on your particular use case. Desktops at home or office are already behind a firewall and implementing firewalls onto your local machine is redundant.

Cloud environments on the other hand are much more insidious, and services running on your VM can inadvertently leak information without proper firewalls in place. You have to think of various edge cases and carefully weed out all the possibilities if you want to secure your server.

We always try to balance security vs availability. A system that is too much locked out is difficult to use and harder to maintain, while a system with too generous a security profile is more prone to attacks and exploits.

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