Linksys E2500 Rounter and DHCP Addressing

Recently Bought a new Linksys E2500 Router to replace my D-Link router and move to Wireless N Speeds. Was having problems with the D-Link and the Client Machines getting a 192.168.203.x DHCP Address (never did figure this out). No idea where this address was coming from and the Client Machine Wireless Connection to the D-Link was getting spotty at best. Client Machines include a Sony Laptop with a Aethos(sp?) network card, a Dell M4600 with Intel(R) 82579LM Gigabit Network Card, a MAC Book (not sure about the Network Card) , a couple of Workstations (HP and Home Built) and Samsung and Panasonic Network TV's. I am once again seeing this 192.168.203.x Network address being "given" to the client machines every once in a while. Some of them are actually wired and some are wireless, either of which can get this IP Address Subnet. Why? Where is this coming from? I could see this happening to the wireless clients possibly from another wireless network and crossing over, maybe (which is one of the reasons I replaced the Router). The Wired Clients getting this address I just don't understand how. The problem went away for about 2 weeks after I replaced the D-Link with the new Linksys Router, but now seems to have resurfaced. Is this somehow coming from the Time-Warner Motorolla Modem for the Cable Internet? How do I fix this? How can I figure out where this is coming from? I've tried using Wireshark to isolate what is going on, but can't figure out the right parameters to isolate the issue.
Thanks,
Loren

On a computer, which gets the wrong IP address, open a command prompt window, enter "ipconfig /all" and post the full output.
How did you connect the E2500 to your modem? Which port did you use?
Which public IP address do you see on the status page of the E2500?

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=====
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===========
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From my original post.
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ROGO22 wrote:
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