Date: Wed, 29 Oct 2008 21:25:54 -0500 From: Jack Barnett <jackbarnett@gmail.com> To: Polytropon <freebsd@edvax.de> Cc: Freebsd questions <freebsd-questions@freebsd.org> Subject: Re: Firewalls in FreeBSD? Message-ID: <49091B32.9060306@gmail.com> In-Reply-To: <20081030031231.8a5fccb9.freebsd@edvax.de> References: <49090BA3.5090407@gmail.com> <20081030031231.8a5fccb9.freebsd@edvax.de>
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yes, that is my setup.
hrm... well, I disabled the firewall completely, restarted, but still
doesn't work.
I have gateway and natd both enabled. x10 is the "external" interface
(the one that is dhcp and connects to the cable modem).
I don't want to redirect anything to my windows box. I just want
anything that connects out from my windows box to be able to connect
or send data back in.
For example, I load up a client (game) and it connects out on XYZ
port. The server will send data back on ABC.
The problem, from what I can tell; is that I can get a connection out
- but when the server tries to send data back on ABC it is discarded.
Polytropon wrote:
If I understood you correctly, your setting is:
(Modem/Router)---DHCP---(FreeBSD)---("Windows")
I may respond directly on your configuration settings:
On Wed, 29 Oct 2008 20:19:31 -0500, Jack Barnett [1]<jackbarnett@gmail.com> wro
te:
gateway_enable="YES"
#firewall_enable="YES"
#firewall_type="open"
firewall_type="simple"
#firewall_type="open"
firewall_logging="YES"
Use instead:
gateway_enable="YES"
natd_enable="YES"
natd_interface="xl0"
You may add special redirect directives to NATD's settings, such
as
natd_flags="-redirect_port tcp 192.168.1.2:5900 5900"
natd_flags="-redirect_port tcp 192.168.1.5:23 6666"
or
natd_flags="-redirect_address 192.168.1.2 141.44.165.58 \
-redirect_address 192.168.1.5 141.44.165.58"
Examples taken from a very old configuration. :-)
Then,
firewall_enable="YES"
firewall_type="/etc/ipfw.conf"
Then, be sure to have nice firewall settings, you can use things
similar to this, enabling just the services you really need and want,
it's easy to write your own one or to rewrite this:
-f flush
add divert natd ip from any to any via xl0
add allow tcp from any to any ftp in recv xl0
add allow tcp from any to any ssh in recv xl0
add allow tcp from any to any auth in recv xl0
add allow udp from any to any ntp in recv xl0
add allow udp from any to any ntalk in recv xl0
add deny udp from any to any x11 in recv xl0
add reset tcp from any to any x11 in recv xl0
add allow ipencap from any to any
add allow ip from any to any
This should work fine. NB to use the correct interface names.
References
1. mailto:jackbarnett@gmail.com
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