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NAT Specific IPs in Cisco router

We have some IP addresses in a public DNS , assigned for different purposes for instance:
SMTP.mycompany.com =65.65.65.65
OWA.mycompany.com=66.66.66.66

we purchased the IPs listed above from the registrar.
I would like to know how to configure the NAT on Cisco router, so that when it receives:
65.65.65.65 on the external interface of the router it will NAT it and send it to 10.100.100.100 [our exchange Mailbox server IP]
66.66.66.66 on the external interface of the router it will NAT it and send it to 10.100.100.200 [our exchange Front End server IP]

How is this configured in Cisco Router?

thanks

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psychogr

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Garry Glendown

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jskfan

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I don't know if Port forwarding is mandatory..
The reason I am saying this because 65.65.65.65 will be an IP address reserved for Exchange server email, when internet users send an email to mycompany.com

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Garry Glendown

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jskfan

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do we need to specify the port [25], or we don't need to, since 65.65.65.65 is always NATTED to exchange server IP address 10.100.100.100 ???

I also believe we just need to open port 25 for SMTP, 80, 443 foe secure SSL iused by OWA.

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Garry Glendown

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jskfan

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Thanks Guys!