3Com 3CR856-95 manual Configuring the Firewall, Virtual Servers Menu, Setting up One-to-One NAT

Setting up One-to-One NAT

The following criteria must be met to be able to use One-to-One NAT:

■You must have a static Internet IP address for every computer on your network plus one for the Gateway itself.

■The addresses must be in one continuous block in the same subnet

■You must have selected Static IP Address as your IP Allocation Mode and have given your Gateway the first of the Internet addresses allocated by your ISP.

Figure 40 One-to-One NAT Screen

To set up One-to-One NAT:

1Select One-to-One NAT from the NAT Mode drop-down box.

2Enter the second address of your Internet range of addresses in the First IP Address in ISP Pool field.

3Enter the first address in your LAN range of addresses to which you want to map this range in the First IP Address in LAN Pool field.

3Com recommends that you set your DHCP pool to the same as the range of LAN addresses used as your LAN pool.

4Enter the number of addresses in the range into the Pool Size field.

5Click Apply to save your changes.

Configuring the Firewall

On the main frame of the Firewall setup screen is a menu with four tabs: Virtual Servers, PC Privileges, Special Applications, and Advanced. These enable you to set the access to and security of your network.

The Virtual Servers Menu

Selecting the Firewall option on the main menu displays the Virtual Servers screen. (Figure 41)

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