02-17-2005
Firewall - 2 Internet accesses - routing rules from source
Hello,
I would like to modify my firewall configuration for being able to handle 2 internet connections in my Red zone.
I would then like to configure some selecting routing rules depending on the internal source.
Actual configuration:
=====================
1 router A (ISP)
|
| (Red) with different public adresses
|
FW---------------- (Orange)
|
|(green)
|
===================== (LAN)
the default gateway of my firewall is fixed to the @ of my ISP router
New desired configuration :
=====================
I now have 2 ISP providers with 2 different routers. (belonging to my ISP)
In the future I even think to add some more new ones.
routers A(ISP-A) and router B (ISP-B)
-------------
|
| (Red) with different public adresses
|
FW---------------- (Orange)
|
|(green)
|
===================== (LAN)
I wish to configure some routing rules in my firewall, so to be able to select the INTERNET exit gateway depending on the internal source.
I succeeded to make a simulation of this situation, using a Linux server as firewall and router.
I configured all rules in the Linux box using commands like : iptables, ip rule, an so on... .
I used some examples found in books and in Internet pages or forum.
But now I'm looking in a way to do it in my PRODCTION environment with my SMOOTHWALL-SERVER firewall.
I did not succeed to find how to do it with the Web interface of this product. Or better say, I did not know exactly where to look for it.
I even tried to force a configuration in a text mode command. But it seems that ip rule commands are not usable in the kernel situation of the Smoothwall.
If anyone knows how to do it with Smoothwall Server or Smoothwall Express I would appreciate some help. From a Smoothwall Express example, I would surely find a similar way of doing it with Smoothwall Server.
Here is the example of the routing rules I would like to be able to configure.
* all internet traffic from a server A in my LAN zone should pass through router B to go to the INTERNET.
* and all the traffic from all other computers or servers from my LAN should go through router A.
or the same rule for computers in my orange zone.
* all internet traffic from a server B in my orange zone should pass through router B to go to the INTERNET.
* and all the traffic from all other computers or servers from my orange zone should go through router A.
My question will perhaps seems a little bit tricky or even stupid for some of you.
But I'm a beginner in firewall configuration and I do not know much about it.
I just a begginer and any help will be fully appreciate.
Thanks for any indications or help that can guide me through my researches an tests.
Excuse all english mistakes in this text. I'm just a french guy and I do not write in english very often.
Thanks to all of you.
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LEARN ABOUT DEBIAN
arno-iptables-firewall
ARNO-IPTABLES-FIREWALL(8) ARNO-IPTABLES-FIREWALL(8)
NAME
arno-iptables-firewall - Single- & multi-homed firewall script with DSL/ADSL support.
SYNOPSIS
/etc/init.d/arno-iptables-firewall [start|stop|status|force-reload|restart]
DESCRIPTION
arno-iptables-firewall is an iptables configuration script with support for both IPv4 & IPv6. While it is extremely easy to use one can
nevertheless use it in quite complicated environments.
All available options are explained in the extensively documented configuration file.
The external interface of the system needs to be set up properly in the firewalls configuration file (EXT_IF). The default behavior of the
firewall is to deny all incoming connections.
For additional requirements not covered by the configuration file custom iptables rules can be placed in /etc/arno-iptables-firewall/cus-
tom-rules. This file is automatically parsed by the service script.
See the README file (eg. in /usr/(local/)share/doc/arno-iptables-firewall) for an example how to manage logging of firewall events through
syslogd.
The arno-fwfilter script can be used to make the firewall logs more readable for humans (see manpage).
Several plugins for the firewall script are available online. Plugins can be downloaded from http://rocky.eld.leidenuniv.nl/ Please see the
README file for more information.
FILES
/etc/init.d/arno-iptables-firewall system service script
/etc/arno-iptables-firewall/firewall.conf firewall configuration
/etc/arno-iptables-firewall/conf.d/ firewall configuration directory
/etc/arno-iptables-firewall/custom-rules custom iptables rules
/etc/arno-iptables-firewall/blocked-hosts host blacklist
/etc/arno-iptables-firewall/mac-addresses mac filter list
Please note, that the last two files do exist in the initial configuration and their use is disabled in /etc/arno-iptables-firewall/fire-
wall.conf
SEE ALSO
iptables(8), arno-fwfilter(1), syslog.conf(5)
The http://rocky.eld.leidenuniv.nl/ web site.
AUTHOR
arno-iptables-firewall was written by Arno van Amersfoort <arnova@rocky.eld.leidenuniv.nl>.
This manual page was written by Michael Hanke <michael.hanke@gmail.com>, for the Debian project (but may be used by others).
Michael Hanke March 14, 2012 ARNO-IPTABLES-FIREWALL(8)