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Old 3rd January 2011
unixjingleman unixjingleman is offline
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Default dmz and firewall questions

Hi there
I'm totally new to OpenBSD. I do have 2 years UNIX experience via Linux. I'm currently wanting to set up a network with 2 servers in a DMZ in order to separate them from an internal network. I want to use an OpenBSD dedicated firewall. This firewall will have 3 network interfaces on it. One network interface will connect to the external router/modem(router and modem in one box), one interface will connect to the DMZ and the other interface will connect to the internal network. The router/modem lets you put, i think it's 1 or 2, interfaces in a DMZ. But, when i think of any of the dedicated firewall's or servers' interfaces it doesn't make sense to me to put any of them in the router/modem's DMZ( I'm think it would be better for the dedicated firewall's and the servers' interfaces to have static private I.Ps ie 192.168.2.4 etc right?). What i mean is that even if, as far as the router/modem is concerned, none of the interfaces were in a DMZ, the area where the servers are would still effectively be a perimeter network and with such a set up would still be, effectively,a DMZ, right?. If i should put any of these interfaces in this DMZ please let me know which one.
Thank you for your time. This is really not a joke i am in fact still a UINX n00b
regards Unixjingleman
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Old 3rd January 2011
ocicat ocicat is offline
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Quote:
Originally Posted by unixjingleman View Post
But, when i think of any of the dedicated firewall's or servers' interfaces it doesn't make sense to me to put any of them in the router/modem's DMZ( I'm think it would be better for the dedicated firewall's and the servers' interfaces to have static private I.Ps ie 192.168.2.4 etc right?).
I can only assume that you are getting some dynamic DHCP address assigned from your provider. That's fine. The external interface on your firewall can be configured for dynamic addresses.

Otherwise, you are correct. A firewall must be configured with different subnets on the different interfaces. The interface used for your private network can use private addresses. You have the choice of either setting up each internal host with static IP addresses on their interfaces, or you can configure a DHCP server within your internal network to assign dynamic address.

As a newcomer to OpenBSD & pf(4), you will save yourself significant time & aggravation by studying the official FAQ including the PF User's Guide along with the pf(4) manpage. The only third-party introduction to pf(4) worth the the time to study is Hansteen's manuscript:

http://home.nuug.no/~peter/pf/
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Old 3rd January 2011
unixjingleman unixjingleman is offline
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Thank you very much for your reply. So the dedicated firewall(OpenBSD box) can do NAT and dhcp for the servers(in the DMZ) and the hosts on the internal network?. So should i put the interface that connects the OpenBSD dedicated firewall to the external router/modem(router and modem in one) in the DMZ of the external router/modem?. Then the servers in the DMZ of the dedicated firewall(OpenBSD box)?.
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Old 3rd January 2011
ocicat ocicat is offline
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Quote:
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So the dedicated firewall(OpenBSD box) can do NAT and dhcp for the servers(in the DMZ) and the hosts on the internal network?.
Yes, however, there is an advantage to separating functionality (firewall & DHCP) if you have the hardware.
Quote:
So should i put the interface that connects the OpenBSD dedicated firewall to the external router/modem(router and modem in one) in the DMZ of the external router/modem?.
Your modem/router was designed to be used as a single device serving multiple functions. By inserting another box running OpenBSD & pf(4), you are deprecating the firewall functionality of your modem/router. As such, I would connect the OpenBSD firewall's external address to the modem/router's internal DMZ interface.
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