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PIX515 6.3(4) DMZ to DMZ communication (public IP to private IP)

Posted on 2014-09-29
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Last Modified: 2014-10-01
Hi,

Our PIX-515 running 6.3(4) has 6 interfaces.

inside security100
DMZ01 security80
DMZ02 security60
DMZ03 security40
DMZ04 security20
outside security0

Outside and DMZ03 are using PUBLIC IPs, all other interfaces uses private IPs.

I would like to relay mail (smtp) from a server in DMZ03 to a filtering server in DMZ01 wich is a more secure interface.

Right now I can ping from DMZ01 to DMZ03 using NAT and GLOBAL statements.
I have many CONDUIT statements from DMZ02 to DMZ01 but these are between private IPs, so it's pretty easy.

I have NO IDEA how to get DMZ03 to communicate with DMZ01 !

Thanks for your help !
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Question by:Phil_Trahan
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Accepted Solution

by:
Ken Boone earned 2000 total points
ID: 40352217
So you have to think in terms of security levels.   When going from a lower level to a higher level you always need a nat and an access-list (conduit in your case).

So since you are going to a device on DMZ01 you need to build the static first.

static (DMZ01,DMZ03) x.x.x.x x.x.x.x
x.x.x.x is the real address of the filtering server in DMZ01.  We are saying that the filtering server will be known by his real address on DMZ03 with this statement

Then you need a conduit - something like this:
conduit permit tcp host y.y.y.y  host x.x.x.x eq smtp

y.y.y.y is the mail server on DMZ03 and x.x.x.x is the real filtering server address on DMZ01.

Hope this helps.
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Author Closing Comment

by:Phil_Trahan
ID: 40355979
It works!

Thank you very much for your help M. Boone!
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