The Network page determines the network address scheme of your SonicWALL. You can choose from six options: Standard, NAT Enabled, NAT with DHCP Client, NAT with PPPoE Client, NAT with L2TP Client, and NAT with PPTP Client.
Network Address Translation (NAT) connects your entire network to the Internet using a single IP address. Network Address Translation offers the following:
Internet access to additional computers on the LAN. Multiple computers can access the Internet even if your ISP only assigned one or two valid IP addresses to your network.
Additional security and anonymity because your LAN IP addresses are invisible to the outside world.
If your ISP hasn't provided enough IP addresses for all machines on your LAN, enable NAT and assign your network a private IP address range. You should use addresses from one of the following address ranges on your private network:
Tip! If your network address range uses valid TCP/IP addresses, Internet sites within that range are not accessible from the LAN. For example, if you assign the address range 126.96.36.199 - 188.8.131.52 to your LAN, a Web server on the Internet with the address of 184.108.40.206 is not accessible.
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.
Select NAT Enabled from the Network Addressing Mode menu.
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.
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.
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.
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.
Enter your WAN subnet mask in the WAN/LAN Subnet Mask field. This subnet mask should be assigned by your ISP.
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.
Click Update. Once the SonicWALL has been updated, a message confirming the update is displayed at the bottom of the browser window. Once the network settings have been updated, the Status bar at the bottom of the browser window displays "Restart SonicWALL for changes to take effect."
Alert! If you change the SonicWALL LAN IP Address, you must to change the Management Station IP address to be in the same subnet as the new LAN IP address.
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:
The SonicWALL WAN Gateway (Router) Address is "10.1.1.1".
The SonicWALL WAN IP (NAT Public) Address is "10.1.1.25".
The private SonicWALL LAN IP Address is "192.168.168.1".
Computers on the LAN have private IP addresses ranging from "192.168.168.2" to "192.168.168.255".
In this example, "192.168.168.1", the SonicWALL LAN IP Address, is used as the gateway or router address for all computers on the LAN.
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