FW: Application layer firewall on FreeBSD, is it possible ?

Daniel Dvořák dandee at hellteam.net
Wed Aug 31 00:16:28 GMT 2005

... but you know, proxy is not what I am asking, proxy is not firewall.

We do not need to restrict everything and all members.

We like full routeable network with full access to IPv6 / IPv4 internet
without any necessary action like configure proxy clients at all pc´s our

We only want to deny only p2p applications by default for all pc´s
regardless of used protocol/ports and to allow grantting access to p2p
networks each members in individual way, because we have to prevent another
letter from our ISP which was contacted by BSA that from our public IP (
from one member in private ip space ) ... traffic ... share ... violate ...
authorial law. 

So of course it must be combination of IP and application osi model

Gateway server should check all packets and their contents to decide if
allowed or denied in fast way like l7-filter on Linux OS.

So is it possible on FreeBSD OS ?




From: Daniel Dvořák [mailto:dandee at hellteam.net] 
Sent: Wednesday, August 31, 2005 1:47 AM
To: 'freebsd-questions at freebsd.org'; 'freebsd-ipfw at freebsd.org';
'freebsd-pf at freebsd.org'
Subject: Application layer firewall on FreeBSD, is it possible ?

Hi all,

let me ask you for task "how to control p2p applications and their traffic
with dynamic ports from user´s commputers on gateway".

We are small wireless community and have shared access to internet for all
members. Core members decided to control p2p traffic by default and to allow
each person in individual way, after showing their knowledge of authorial
low. :)

But since many dc hubs, edonkey servers, bittorents web trackers and so on
use dynamic not standard ports, how to control it ?

Linux use l7-filter  <http://sourceforge.net/projects/l7-filter>
sourceforge.net/projects/l7-filter sourceforge freeware and , it is based on
iptables, defination application protocols like ethereal project do.

So, is there any way to do same application layer osi model firewall with
FreeBSD gateway ?

Of course, I tried to find on web, I have not been successful in searching
so far.

If my question is not right in this mailing list, if my question is annoying
here, so I am sorry.


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