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How to configure port forwarding on a Cisco 1720 Router

Hello All:

My sister company has a Cisco 1720 Router.  I am installing a Barracuda Spam firewall for them.  I need to point port 25 on the 1720 router to the Barracuda Spam firewall so it will filter the mail before it gets to the exchange server.  I did this with no problem at my other two companies but we are using Netopia routers which is easier to configure.  Could anyone give me the steps to do this on the Cisco 1720 router?  

2 Solutions
I would assume that there is already a rule pointing port 25 to the Exchange server and that will just have to change to the new Barracuda's IP..
Look for something like this in the router config:
  ip nat inside source static tcp <exchange IP> 25 <public ip> 25

To change it:
  no ip nat inside source static tcp ip.add.ress 25 pub.ip.add.ress 25
  ip nat inside source static tcp barracuda.ip.add.ress 25 pub.ip.add.ress 25

huntersp3Author Commented:
Hello Lrmoore:

I found the information in the running-config. Then do I enter into configure terminal mode to change the information?
Yes you will cave to enter "config t" then enter the commands he gave you.

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