SonicWALL Internet Security Appliances - Manual (Page 79)

Page 80 SonicWALL Internet Security Appliance Administrator’s Guide
When NAT is enabled, users on the Internet cannot access machines on the LAN unless they have
been designated as Public LAN Servers.
To enable Network Address Translation (NAT), complete the following instructions.
1. Select NAT Enabled from the Network Addressing Mode menu in the Network window.
2. Enter a unique IP address from your LAN address range in the SonicWALL LAN IP Address field.
The SonicWALL LAN IP Address is the address assigned to the SonicWALL LAN and is used for
management of the SonicWALL.
3. Enter your network subnet mask in the LAN Subnet Mask field. The LAN Subnet Mask tells the
SonicWALL which IP addresses are on your LAN. Use the default value, "255.255.255.0", if
there are less than 254 computers on your LAN.
4. Enter your WAN router or default gateway address in the WAN Gateway (Router) Address field.
This is the device that connects your network to the Internet. If you use Cable or DSL, your WAN
router is probably located at your ISP. If you use a router located at your site, use the IP address
assigned to it.
5. Enter a valid IP address assigned by your ISP in the SonicWALL WAN IP (NAT Public) Address
field. Because NAT is enabled, all network activity appears to originate from this address.
6. Enter your WAN subnet mask in the WAN/LAN Subnet Mask field. This subnet mask should be
assigned by your ISP.
7. Enter your DNS server IP address(es) in the DNS Servers field. The SonicWALL uses these DNS
servers for diagnostic tests and for upgrade and registration functionality.
8. Click Update. Once the SonicWALL has been updated, a message confirming the update is
displayed at the bottom of the browser window. Restart the SonicWALL for these changes to
take effect.
If you enable Network Address Translation, designate the SonicWALL LAN IP Address as the gateway
address for computers on your LAN. Consider the following example:
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The SonicWALL WAN Gateway (Router) Address is "10.1.1.1".