Just set a static command for your inside addresses
Say your inside network is 10.1.1.0/24 and your dmz is named dmz, the
static would be:

Static (inside,dmz) 10.1.1.0 10.1.1.0 netmask 255.255.255.0

There are a couple of Cisco pages to explain further:

http://www.cisco.com/warp/public/110/mailserver.html 

http://www.cisco.com/warp/public/110/mailserver_dmz.html 

Glenn

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]] On Behalf Of kk downing
Sent: Tuesday, March 26, 2002 7:53 PM
To: [EMAIL PROTECTED]
Subject: PIX DMZ access with NAT internal hosts

Hello,
I have host are an internal network wich are being
NATd to a global legal IP address. I also have a mail
server on the DMZ which is also being NATd to a global
IP address. When I try to connect from a host on the
internal network to the mail server I see the the PIX
build the translation to the public IP address and the
connecton fails. What is the proper procedure to let
the internal hosts access to the mail server on the
DMZ? I would think that the internal hosts which come
from a higher security interface would be allowed to
access the mailhost on the dmz which of course is a
lower security interface. Is there a way to not NAT my
internal hosts for access to the mailhost? Thanks in advance

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