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        Latest News and Testimonials

        Aug 13, 2018 - FireHOL v3.1.6 released [more ...]

        Apr 27, 2014 - I just wanted to thank you for ... [more ...]

        What are FireHOL and FireQOS?

        FireHOL is a language (and a program to run it) which builds secure, stateful firewalls from easy to understand, human-readable configurations. The configurations stay readable even for very complex setups.

        FireQOS is a program which sets up traffic shaping from an easy-to-understand and flexible configuration file.

        Both programs abstract away the differences between IPv4 and IPv6. so you can concentrate on the rules you want. You can apply rules for IPv4 or IPv6, or both, as you need.

        We think the best advert for these programs are their configurations. See below for:

        The two programs are shipped together but work independently so you can choose to use one or both.


        Uses for FireHOL and FireQOS

        Almost every Linux firewall / traffic control need is covered, including:


        FireHOL is an iptables firewall generator producing stateful iptables packet filtering firewalls, on Linux hosts and routers with any number of network interfaces, any number of routes, any number of services served, any number of complexity between variations of the services (including positive and negative expressions).

        Writing a complete, safe, firewall, suitable for protecting a host and a network can be this easy:

        interface eth0 mylan
            policy accept
        interface ppp+ internet
            server smtp accept
            server http accept
            server ftp  accept
            server ssh  accept src example.www.jshhty.com
            client all  accept
        router mylan2internet inface eth0 outface ppp+
            route all accept

        Jump straight to the documentation to learn how to configure your own.

        Hopefully you have noticed that all the rules given match just one direction of the traffic: the request. They don't say anything about replies. This is because FireHOL handles the replies automatically. You don't have to do anything about them: if a request is allowed, then the corresponding reply is also allowed. This also means that FireHOL produces the iptables statements to exactly match what is allowed in both directions and nothing more.

        FireHOL is a language to express firewalling rules, not just a script that produces some kind of a firewall.

        Is it secure?

        FireHOL is secure because it has been designed with the right firewalling concept: deny everything, then allow only what is needed.

        Also, FireHOL produces stateful iptables packet filtering firewalls (and possibly, the only generic tool today that does that for all services in both directions of the firewall).

        Stateful means that traffic allowed to pass is part of a valid connection that has been initiated the right way. Stateful also means that you can have control based on who initiated the traffic. For example: you can choose to be able to ping anyone on the internet, but no one to be able to ping you. If for example you don't need to run a server on your Linux host, you can easily achieve a situation where you are able to do anything to anyone, but as far as the rest of world is concerned, you do not exist!

        Learn another language?

        FireHOL has been designed to allow you configure your firewall the same way you think of it. Its language is extremely simple. Basically you have to learn four commands:

        Commands client and server have exactly the same syntax. A FireHOL interface has two mandatory arguments and a router has only one (and this is the same as one of the two that interface requires). All of the optional parameters are the same to all of them. This sounds like just one command is to be learned...

        Of course there are a few more commands defined, but all of them exist just to give you finer control on these four.

        If you don't believe it is simple, consider this example.


        As an IT executive, responsible for many dozens of Linux systems, I needed a firewalling solution that would allow me and my team to have a clear and simple view of what is happening on each server, as far as firewalling is concerned. I also needed a solution that will allow my team members to produce high quality and homogeneous firewalls independently of their security skills and knowledge. After searching for such a tool, I quickly concluded that no tool is flexible, open, easy, and simple enough for what I needed.

        I decided to write FireHOL in a way that will allow me, or anyone else, to view, verify and audit the firewall of any Linux server or Linux router in seconds. FireHOL's configuration is extremely simple... you don't have to be an expert to design a complicated but secure firewall.

        What features does it have?

        FireHOL handles firewalls protecting one host on all its interfaces and any combination of stateful firewalls routing traffic from one interface to another. There are no limitations on the number of interfaces or on the number of routing routes (except the ones iptables has, if any).

        FireHOL, still lacks a few features: QoS for example is not supported directly. You are welcome to extend FireHOL and send me your patches to integrate within FireHOL. In any case however, you can embed normal iptables commands in a FireHOL configuration to do whatever iptables supports.

        Since FireHOL produces stateful commands, for every supported service it needs to know the flow of requests and replies. Today FireHOL supports the following services:


        FireQOS is a traffic shaping helper. It has a very simple shell scripting language to express traffic shaping. You run FireQOS to setup the kernel commands. You can also run it to get status information or dump the traffic of a class. FireQOS is not a daemon and does not need to run always to apply traffic shaping.

        Configuring a complete, functional, traffic shaping setup can be this easy:

        LINKTYPE="adsl local pppoe-llc"
        interface ${DEVICE} world bidirectional ${LINKTYPE} input rate ${INPUT_SPEED} output rate ${OUTPUT_SPEED}
            class voip commit 110kbit pfifo
                server sip,rtp
                client sip,stun
            class interactive input commit 20% output commit 30%
                server dns,ssh,hangouts,icmp
                client dns,ssh,hangouts,gtalk,jabber,teamviewer,facetime
            class vpns input commit 20% output commit 30%
                server pptp,GRE
            class synacks commit 5%
                match tcp syn
                match tcp ack
            class surfing commit 5%
                client surfing,rsync
            class default
            class background commit 5%
                client torrents
                server mytorrents prio 1

        Jump straight to the documentation to learn how to configure your own.

        FireQOS also allows you to monitor the live status of traffic:

        # ./sbin/fireqos.in status adsl-in
        FireQOS v1.0 DEVELOPMENT
        (C) 2013 Costa Tsaousis, GPL
        adsl-in: eth0 input => ifb0, type: adsl, overhead: 26
        Rate: 10500Kbit/s, min: 105Kbit/s, R2Q: 8 (min rate 105Kbit/s)
        Values in Kbit/s
          CLASS    voip realtim clients torrent default
        PRIORIT       1       2       3       5       4
         COMMIT     105    1050    1050     105     105
            MAX   10500   10500   10500    9450    9450
           adsl-in (eth0 input => ifb0) - values in Kbit/s
          TOTAL    voip realtim clients torrent default
             46       -       7       -      39       -
             50       -       5       -      42       3
             80       -       9       -      60      11
             75       -       6       -      65       4
            103      19       3       -      79       2
             56       -       3       -      50       3
             84       -       5       -      70       9
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