ASA 5520 port redirection help.

Dear Experts

How could I map two outside addresses (Global IPs)to the same inside Server
in ASA 5520 firewall?
Actually we have an SMTP server gateway, and two Exchange servers connecting
to it, so how can I redirect all external SMTP traffic for the Exchange
servers and send it to the SMTP gateway.

When I do this on the firewall, I got an error

static (dmz,outside) tcp x.x.6.5 smtp 192.168.1.11 smtp netmask
255.255.255.255 static (dmz,outside) tcp x.x.6.8 smtp 192.168.1.11 smtp
netmask 255.255.255.255
ERROR: duplicate of existing static
  TCP dmz:192.168.1.11/25 to outside:x.x.6.5/25 netmask 255.255.255.255

Please advise

Thanks in advance

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Received on Sun Sep 04 2011 - 12:28:02 ART