How to assign a private IP address to a public IP address

Hello.
At the beginning sorry for my poor English. My company uses a Cisco 881 router and I have the following problem to resolve. I need to assign an local IP address from my private network to an public IP address (this is the public IP address of the SMTP server). As a result, I want to do the following thing: I would like to use an local IP address in the SMTP server settings of the email client instead of an IP address of the service provider. Device, which I have to configure with SMTP server is connected via a VPN and I can't use a public IP address of email provider. Thank you for any respond.

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2) Click the Advanced button, and then click Port Mapping.
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How is the "Private IP address" field supposed to work?

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With Linksys routers, a fixed (static) LAN IP addresses must be assigned in the device that is using the address. So you need to enter the fixed address in the computer or printer, not in the router.
When using a Linksys router, any fixed LAN IP address must be outside the DHCP server range (typically 192.168.1.100 thru 192.168.1.149), and it cannot end in 0, 1, or 255.
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I have a Brother HL-2070N Laser Network printer connected to my Airport Network via an ethernet connection to a switch which is connected to the Airport Extreme Base Station. The Airport is set up as a DHCP server.
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1
If I make Azure VPN, it is assigned the specified range automatically ? ( in this case, 10.0.1.0/24 ).
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Portal ?

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Gateway - Usually this is your router. When you talk about your gateway, generally you are talking about the ip address your router uses.
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(The Dynamic/Static relates to how an ip address is assigned.)
a) Static : Your ISP assigns an IP number and cannot be change by user (client).
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b) Dynamic : Your ISP assigns an IP number and you can change it. This means that every time your DSL modem is rebooted, your ISP assigns a new IP number for it.
To do : Turn your modem off/on. (Wait for 15 seconds between off/on.)
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How to assign a private IP address to a public IP address

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