I've configured my Win2k box to contact DNS directly, and both Direct Connect and VNC Server are running smoothly (port forwarding is being accomplished (per your suggestion) by natd.conf).

I've set the firewall type to 'OPEN' (the Win2k client has ZoneAlarm protection of its own); this is truly the only sticking point. I'm under the impression that selecting 'SIMPLE' rather than 'OPEN' provides an additional layer of protection to the gateway by preventing certain spoofing attacks. Unfortunately, I seem unable to switch the firewall type without crippling my Win2k box's functionality. Perhaps I'll give it a go again sometime in the future.

Here's a copy of the relevant files:


interface rl0
redirect_port tcp 5800
redirect_port tcp 5900
redirect_port tcp 412
redirect_port tcp 1412
punch_fw 2000:50


ifconfig_rl1="inet netmask"
# firewall_type="SIMPLE"
natd_flags="-f /etc/natd.conf"


James Earl wrote:
If you want your gateway to forward DNS queries from your private
network, you will probably have to run named to answer the DNS queries
and forward them out to your ISP's name servers.

You may also want to run a DHCP server.

I don't believe ipfw has the forwarding capability your looking for in
this case.

You may want to get the DNS setup first, and then enable ipfw once you
know that named is setup properly.

As for the firewall rules, you'd probably just have to modify slightly
the DNS related ones that already exist under "SIMPLE."  Instead of
letting DNS queries in from the outside, you want to let DNS queries in
from the "inside."

Let me know if you have any other questions, and I'll try to help.


On Mon, 2004-01-19 at 21:06, Rishi Chopra wrote:

If I want the gateway to forward DNS queries (e.g. have the win2k box query the gateway for DNS requests) what do I need to do? What would the rule look like?

James Earl wrote:

On Mon, 2004-01-19 at 13:58, Rishi Chopra wrote:

What I want to do: (1) Change firewall type from 'OPEN' to 'SIMPLE' and (2) Forward ports 412 and 5800 to my Win2k box.

What I have: The setup is pictured below. IPFIREWALL_DEFAULT_TO_ACCEPT, IPDIVERT and IPFILTER are all enabled in my kernel config file, are also enabled. Rule-of-thumb advice about "how best to secure a network" is not necessary in this case (the Win2k box has its own firewall installed (ZoneAlarm) and I already know too much about security).

ISP FreeBSD Gateway Win2k Box



The problem: When I chenge the firewall type to SIMPLE from OPEN, the Win2k box can no longer query DNS and pings to the address do not work. With the firewall type set to OPEN, there are no problems whatsoever. I am also new to the IPFW syntax.

What I would like to know is: (1) the syntax for forwarding incomming connections from rl0 to rl1 (and ultimately to and (2) whether the syntax for allowing connections to the outside network (such as DNS) is correct and if some other problem is preventing the win2k box

from querying DNS when SIMPLE is enabled.

The FreeBSD Handbook can describe port redirection using NAT better than
I can:


With the SIMPLE firewall rules, all your machines on your LAN should be
able to establish connections.  Make sure that you have your ISP's DNS
servers IP's specified on the win2k machine, and also that your FreeBSD
machines IP is setup as the default gateway in win2k.

You shouldn't be able to ping the FreeBSD gateway from the win2k machine
because of the FreeBSD gateway's firewall.

Anther test... try accessing a machine out on the Internet using it's ip
address and see if you get out.


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