Where is iptables

Instead of iptables, you should actually take consideration in using ufw, the default firewall configuration tool provided by ubuntu internally. After you reboot, the rules that you save will be back in place. You can see that by doing an iptables -L to list the rules. Ubuntu Community Ask! Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Learn more. Where is iptables in Ubuntu Ask Question. Asked 5 years ago. It can be useful, if you want to know how many packets were captured for a specific rule.

There is two ways to managing iptables rules with a text-based user interface, either using setup or system-config-firewall-tui. Using system-config-firewall-tui takes you directly to editing the rules. Using setup you need to select firewall configuration and then you can edit rules.

Starting with setup looks like this:. On the next screen, which is where you start with system-config-firewall-tui , make sure that "Firewall" is enabled, or you cannot edit the settings. Then select Customize :. There is good chance that a service you want to modify is part of the list of standard "Trusted" services. Select the services you want to trust ports to open and press Forward which means 'next', it is not port forwarding :. The Other Ports menu lets you open additional ports not in the list of standard Trusted Services, or to edit an existing list of additional ports :.

To add other ports, specify one port or a port range, and choose between tcp or udp for the protocol. The port range format is beginningPort - endingPort.

The trusted interfaces menu allows you to trust all traffic on a network interface. All traffic will be allowed and the port filtering rules will never match. You should only select an interface that faces a private network, never an interface that directly faces the Internet. The Masquerading menu lets you select an interface to be masqueraded. Masquerading is better known as NAT Network Address Translation , and it is useful for example when your computer is used as gateway to access the internet:.

Port forwarding, also known as PAT , permits traffic from one port to be rerouted to another port. Ubuntu comes with ufw — a program for managing the iptables firewall easily.

You can, however, easily check the status of iptables with the command systemctl status iptables. You can also query iptables with the command iptables -L that will list the active rules. To flush all chains, which will delete all of the firewall rules, you may use the -F , or the equivalent —flush , option by itself: sudo iptables -F. What are the basic differences between between iptables and firewalld?

Answer : iptables and firewalld serves the same purpose Packet Filtering but with different approach. The firewall matches packets with rules defined in these tables and then takes the specified action on a possible match. The script solution allows for slightly more flexibility. You will need to know the interface that you are using in order to apply the rules - if you do not know, you are probably using the interface eth0, although you should check with the following command first to see if there are any wireless cards: iwconfig If you get output similar to the following, then you do not have any wireless cards at all and your best bet is probably eth0.

Just remove the -c to only save the rules. Alternatively you could add the iptables-restore and iptables-save to the if-pre-up. NOTE: Scripts in if-pre-up. Configuration on Startup for NetworkManager NetworkManager includes the ability to run scripts when it activates or deactivates an interface. To save iptables rules on shutdown, and to restore them on startup, we are going to create such a script. But if you do a lot of development work, you may want to have your iptables saved everytime you reboot.

To do this open the rules file in your favorite text editor in this example gedit. Feel free to edit this to file and save when complete. The following gives some idea of what is happening: --limit sets the number of times to log the same rule to syslog --log-prefix "Denied Shorewall, is a firewall generator for iptables which allows advanced configuration with simple configuration files.

It is available from the Ubuntu repositories via apt-get. CategorySecurity IptablesHowTo last edited by gunnarhj.