How do I connect two lans with different ip?

Hi, I have Linksys switch/hub. I connect them to be virtually one. I have two networks each having different IP addresses. I have a PIX 515 appliance in the office. A host is connected to its dmz port. When I connect the first lan( to the host, there is no problem but if I connect the other lan(, it can't access the the host. Any solutin for this?

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do you have an IP address for the PIX in the subnet?  Since you don't have a router, the PIX needs IP addresses on both subnets so that it can "see" the other lan.

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