I have an existing Sonicwall 2040 that has been using the X0, X1 and X2 interfaces for WAN and two local subnets. Everything works. This morning, I configured the X3 interface and connected to another local Subnet that I am now responsible for, but the routing is not working. I can ping both sides from the Sonicwall, but I can't access anything through it.
I will provide details when they are asked for.