Sonicwall routing between multiple subnets on multiple interfaces

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http://serverfault.com – As shown by the network diagram below, I have two completely separate networks. One is being managed by a Sonicwall NSA 220, the other by some other router (the brand is not important). My goal is to allow devices within the network to access devices in the network. Allowing the reverse ( -> is not required. So far, I have done the following: I connected the X3 Interface on the Sonicwall to the network switch (shown as the dashed red line in the diagram). Next, I gave it a static ip address of and set the (HowTos)