User Guide

Page 33 SonicWALL Internet Security Appliance User’s Guide
Network Settings
Network Addressing Mode
The Network Addressing Mode menu determines the network address scheme of your
SonicWALL. It includes five options: Standard, NAT Enabled, NAT with DHCP Client,
NAT with PPPoE, and NAT with L2TP Client .
• Standard mode requires valid IP addresses for all computers on your network, but
allows remote access to authenticated users.
• NAT Enabled mode translates the private IP addresses on the network to the single,
valid IP address of the SonicWALL. Select NAT Enabled if your ISP assigned you only
one or two valid IP addresses.
• NAT with DHCP Client mode configures the SonicWALL to request IP settings from
a DHCP server on the Internet. NAT with DHCP Client is a typical network addressing
mode for cable and DSL customers.
• NAT with PPPoE mode uses PPPoE to connect to the Internet. If desktop software
and a user name and password is required by your ISP, select NAT with PPPoE.
• NAT with L2TP Client mode uses L2TP to connect to an L2TP server. This mode is
used to connect a SonicWALL to an ISP or other L2TP server.
LAN Settings
• SonicWALL LAN IP Address
The SonicWALL LAN IP Address is the IP address assigned to the SonicWALL LAN
port. It is used for managing the SonicWALL. This IP address should be a unique
address from the LAN address range.
• LAN Subnet Mask
The LAN Subnet Mask defines which IP addresses are on the LAN. The default Class C
subnet mask of "255.255.255.0" supports up to 254 IP addresses on the LAN. If the
Class C subnet mask is used, all local area network addresses should contain the same
first three numbers as the SonicWALL LAN IP Address--for example, "192.168.168."
Multiple LAN Subnet Mask Support
Note: This feature does not replace or substitute configuring routes with the Routes tab in
the Advanced section of the SonicWALL. If you have to define a subnet on the other side
of a router, you must define a static route using the Routes tab in the Advanced section.
Multiple LAN Subnet Mask Support facilitates the support of legacy networks
incorporating the SonicWALL, and makes it easier to add additional nodes if the original
subnet is full. Before you can configure multiple local LAN subnets in the SonicWALL, you
must have the following information:
• Network Gateway Address - This is an IP address assigned to the SonicWALL, in
addition to the existing LAN IP address. If you have configured your SonicWALL in
Standard mode, the IP address should be the Default Gateway IP address assigned
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