Security level Confusion of PIX.

Hi guys,.

I did some Internet research to learn more about the function of security level of this Pix. But in no vain.

You guys can advise me on what this security level 100 or 0 is all about? Do I have to set all the my controls to 100 all out 0 inside? If this is the case, my internal system is unable to access the external network as they are of different security level.

Last question here. I have a router with 2 ints: fa0/0(connect to isp, 100.100.100.2) and fa0/1(connect to a inside pix, 10.2.1.1). My pix off int address is 10.2.1.2(connect àle routeur de la fa0/1), and ethernet1 address is 192.168.1.1. This router will do a NAT on behalf of my internal network.

My problem is that I should do a NAT on the PIX to get my 192.168.1.0 network translate 10.2.1.2 If you access the Internet. From there on, the router will translate addresses translated to public addresses reuse its NAT. In this way, it is a double NAT process. This method is feasible? Any other method better other than making a double NAT?

Please kindly advise me on my 2 doubts. :))

Thank you much in advance.

Hello

Using security levels indicates the relative safety of the interface for the PIX. A level of higher security means that the interface should be treated with a high degree of safety, while a lower security level means that the interface connects to a less reliable network. In general, you can consider your interface LAN internal 100, your DMZ segments as something between 0 and 100 and the interface connected to the internet as 100.

Devices connected to interfaces of high security can initiate connections to the interfaces of low level of security thanks to the use of 'global' commands and "NAT" - you do not use NAT. For devices in low-security interfaces to communicate with devices in the higher security interfaces, you must allow access via an access list and a static statement.

In your configuration, if the NAT router already there is absolutely no reason NAT on the PIX as well. Just set up your router NAT source addresses the 192.168.1.0/24 and you should be fine.

On your PIX, configure the following:

NAT (inside) 0 192.168.1.0 255.255.255.0 0 0

That tells the PIX not to NAT these addresses.

Hope that help - rate pls post if it does.

Paresh

Tags: Cisco Security

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