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NAT statement?

Our ISP has assigned a small (/29) block of routable IPs to our WAN. Our LAN consists of private IPs

The goal is for when our mail server makes an outbound SMTP connection, it goes out on a predictable IP address, so we can designate a PTR DNS record.

I'm assuming an 'ip nat inside source static..' statement would be what we want? Do we tie it to the SMTP protocol?

Any input/direction would be helpful. Thank you

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Re: NAT statement?

ip nat inside source {static {local-ip global-ip}

e.g.

ip nat inside source static

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