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SONICWALL SONICOS STANDARD 3.0 ADMINISTRATOR’S GUIDE
71
Configuring the OPT Interface
Configuring Ethernet Settings
The Ethernet tab in the LAN Properties window allows you to manage the Ethernet settings of LAN
interface. For most networks, you do not need to make any changes on this page.
The LAN Interface Settings information at the top of the Ethernet page is the Ethernet address of
the LAN interface on the SonicWALL security appliance.
Auto Negotiate is selected by default because the Ethernet links automatically negotiate the speed
and duplex mode of the Ethernet connection. If you select Force, you must force the connection
speed and duplex from the Ethernet card to the SonicWALL security appliance as well.
If you select Force, an information dialog is displayed with the following message:
Note: Disabling Auto Negotiate on this interface will also disable AutoMDIX on this interface. You
may need to switch from a straight-through Ethernet cable to a cross over Ethernet cable, or vice-
versa. Click OK to proceed.
Configuring the OPT Interface
You can configure the OPT interface in either Transparent Mode or NAT Mode:
• Transparent Mode enables the SonicWALL security appliance to bridge the OPT subnet onto the
WAN interface. It requires valid IP addresses for all computers connected to the OPT interface on
your network, but allows remote access to authenticated users. You can use the OPT interface in
Transparent mode for public servers and devices with static IP addresses you want visible outside
your SonicWALL security appliance-protected network.
• NAT Mode translates the private IP addresses of devices connected to the OPT interface to a sin-
gle, static IP address.