Firewall – Configure multiple lan interfaces for same subnet on sonicwall

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We have a sonicwall 2400, Is there any way to assign multiple interfaces to the same lan subnet? Basically, we would like to have X1 for the wan and X0, X2, X3 and X4 connected to 4 devices that would form a lan.

EDIT: We are currently limited in space so adding a switch isn't a possibility.

Best Answer

I'm unfamiliar with the 2400 model, but on our SonicWall (a TZ205 running 5.8) we achieve this by adding the interfaces to the LAN Zone and configuring them as a PortShield to the primary LAN interface (X0). Portshield can/does add some extra security, but effectively treats the interfaces as switch ports on the same network.

This is configured via the Network -> Interfaces area, the LAN interface is configured as normal and the "extra" LAN interfaces are set to the LAN zone, PortShield Switch Mode, and PortShield to X0 (our LAN).

X0 - LAN
X1 - WAN
X2 - Portshield to X0
X3 - Portshield to X0
X4 - Portshield to X0

The SonicWall admin guides contain details of the PortShield functionality.

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