This is the situation. There is a DSL Modem (has static IP address X) that is connected to a Sonicwall router (Firewall) with the static IP address already inputted. I need to connect another LAN to use that static IP address. What do I do? I cannot touch the Sonicwall router's settings because I am not allowed! My idea was to connect another router (call it NEW router) to the DSL modem using the static IP settings. I would then connect the Sonicwall router to the NEW router. And also connect my new LAN to the NEW router. The problem is that the LAN IP range and the WAN IP range for the NEW router cannot be the same. Is there a device that allows this? Thanks all.

I'm curious. Why are you not allowed to touch the router? Sounds a little fishy to me. Life is more painless for those who are brainless.

Your plan will not work. You will disable the sonicwall that way. Are you the administrator? Do you have permission to set up an additional network? if so we can help. if not we can't Knowing the correct answer and giving a correct answer, are two different things