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Network Security Firewalls
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Re: Two levels of firewalls

Subject: Re: Two levels of firewalls
Date: Thu, 04 May 2006 10:03:07 +0800
Hi All,
Since there's no mention of the Internet bandwidth provided or any detailed info on incoming/outgoing traffic, I'd like to raise the point that bandwidth traffic should be a consideration when designing the security infrastructure as well as the traffic volume capability of the FWs. After all, it would not be good if the FW becomes a chokepoint for the incoming/outgoing traffic instead...:-)


Cheers,
Jordan Wang


Angel Alonso Párrizas wrote:
Hello all:

I need your advice about a firewall configuration with two levels of them.

In our organization we have a first level of FWs, fortigate 800, that mainly are working such IPS (it is configurated is stealth mode, like a bridge).
In the second one, there is a FW1 separating the differents DMZ zones. There are 3 DMZ behind the FW1 which manage the traffic between them and with the outside (Internet). Also the FW1 does NAT.


There is one DMZ zone with a very high (1) level of security, and other one with a medium level (2) of security and the third is a public DMZ with all the public services like WEB servers.

                        OUTSIDE
                              |
                          fortigate     (IPS in stealth mode)
                              |
PUBLIC DMZ  ..... FW1-----DMZ (2)
                              |
                               ..DMZ(1)


I would like to know if it is a good configuration to move the DMZ Public to a fortigate Interface, and to make the NAT in the first FW fortigate for the hosts in public DMZ. So the configuration will be:



OUTSIDE | fortigat -----Public DMZ | FW1-----DMZ (2) | ...DMZ(1)


Which topology will you do with two levels of firewalls?


Thanks in advance.






-- Angel Alonso Párrizas parrizas@gmail.com <mailto:parrizas@gmail.com>

CCNA, SSP-MPA

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