3Com 3C16111 - SuperStack 3 Firewall Web Site Filter, User Manual

Page: 42 / 214

42 C
HAPTER
3: Q
UICK
S
ETUP FOR THE
F
IREWALL
To configure the WAN networking of your Firewall enter the following
1 In the Firewall WAN IP Address field enter the single address which has
been allocated to your Firewall. Enter the subnet mask for the above IP
address in the
WAN/DMZ Subnet Mask field.
2 In the WAN Gateway (Router) Address field enter the address of your
internet access device. This may be a router, LAN modem or other device
and must be in the same subnet as the WAN IP address of the Firewall.
3 Enter any DNS servers external to your network in the order that you
want them to be accessed. The second server will only be accessed if the
first is unavailable or is unable to answer your query.
4 Click the Next button to proceed to the final part of the configuration.
See “Configuring LAN Settings” on page 44.
Using Multiple Static
IP Addresses
Select the Assigned you two or more IP addresses option and click the
Next button. The Network Address Translation screen will be displayed as
shown in Figure 13 below.
Figure 13 Choosing whether to activate NAT for multiple addresses
You are given a choice of:
■
Don’t use NAT — This will disable Network Address Translation,
limiting you to the same number of IP devices as you have addresses.
■
Use NAT — This will enable Network Address Translation allowing you
to use as many IP devices as you wish on the LAN port. The remaining
public IP addresses can be allocated to devices on the DMZ port.
DUA1611-0AAA02.book Page 42 Thursday, August 2, 2001 4:01 PM