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Setting an IP address on a LAN server interface

Currently my client has a simple LAN network with firewall, as shown here. They want to set an IP on the network interface of their FTP/Web/mail server. They're using a SifoWorks U-series firewall and a Cisco Router 3800 Series, and they have only one public IP address, which they purchased from the ISP. Any suggestions?

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Most firewalls support a "redirect" function that maps one IP/port to another. For example, if your external address is 192.0.2.0 and you want to send Web traffic to your Web server at 10.0.1.3, you would map 192.0.2.0 port 80 to 10.0.1.3 port 80. Check your SifoWorks documentation for the proper command for that firewall.

This was first published in October 2007

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