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General and Network Settings Page 77
• NAT with L2TP Client mode uses IPSec to connect a L2TP server and encrypts all data
transmitted from the client to the server. However, it does not encrypt network traffic to other
destinations.
• NAT with PPTP Client mode uses Point to Point Tunneling Protocol (PPTP) to connect to a remote
server. It supports older Microsoft implementations requiring tunneling connectivity.
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
Alert 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 to your Internet router on the same
subnet. All users on the subnet you are configuring must use this IP address as their default
router/gateway address.
• Subnet Mask - This value defines the size, and based upon the Network Gateway entry, the
scope of the subnet. If you are configuring a subnet mask that currently exists on the LAN, enter
the existing subnet mask address into the Subnet Mask field. If you are configuring a new subnet
mask, use a subnet mask that does not overlap any previously defined subnet masks.
Alert The SonicWALL cannot be managed from any of the additional Network Gateway addresses.
You must use the IP address set as the LAN IP address of the SonicWALL. Also, you cannot mix
Standard and NAT subnets behind the SonicWALL.