How to configure the WLAN Interface in L2 Bridge Mode (WLAN and LAN on same Subnet).
Video Tutorial: Click here for the video tutorial of this topic
Login to the SonicWall management GUI.
Navigate to Network | Interfaces and click Cconfigure for the WLAN interface ( EXAMPLE: X2 as WLAN in this example. Under the Mode/IP Assignment drop-down menu select Layer 2 Bridge Mode. On the Bridged to drop-down menu select the Interface that is setup as your LAN Zone, by default this is the X0 on the SonicWall.
NOTE: You can bridge the SonicWall WLAN with the interface that belongs to LAN or DMZ zone or in other words to any interface which belongs to a custom created zone of Type Trusted or Public. We cannot create the Bridge Pair to WAN which is a Untrusted Zone or any Interface which is part of the WAN Zone.
After selecting the Primary bridged Interface. Click OK .
Now the X0 Interface and the W0 Interface are bridged with the same IP address for their Interfaces.
An auto added allow access rule will be created from WLAN to LAN under Firewall |Access rules.
Under Objects | Address Objects page both W0 (WLAN) Subnet and LAN Primary Subnet will be pointing to the same subnet.
When wireless clients connect to the SonicWall WLAN they will get an IP address from the SonicWall LAN segment.
NOTE:If the SonicWall is the DHCP Server the WLAN clients can get an IP from the LAN DHCP lease scope on the SonicWall. If there is a DHCP server we don’t need to create a IP Helper policy since the WLAN and LAN fall under bridge pair. No relay IP is needed. Thewireless client computers can access the local resources and the Internet without any access rule.
The screenshots above show bridging between X0 and the in-built wireless interface (W0). When using SonicPoint (connected to say the X2 interface), connect the X0 (LAN) interface and the SonicPoints (connected to the X2 (WLAN) interface), to separate switches.