3Com OFFICE CONNECT CABLE/DSL SECURE GATEWAY 3CR856-95, User Manual

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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:
1 Select One-to-One NAT from the NAT Mode drop-down box.
2
Enter the second address of your Internet range of addresses in
the
First IP Address in ISP Pool field.
3 Enter 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.
4 Enter the number of addresses in the range into the Pool Size
field.
5
Click 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 )
dua08 569-5aaa02.bo o k Pag e 45 Thursday , No vem ber 7 , 2002 3:09 PM