Private IP and Default Gateway IP have changed

I'm using a DI-604 router and I have several desktops, laptops and a server connected to the network.

Last night I replace the router by using another one which is the same model "D-Link DI-604". And I found all my computer's private IP has changed.

It used to be 192.168.0.105 and now it changed to 192.168.15.105
The default gateway IP used to be 192.168.0.1 and now it changed to 192.168.15.1

I don't think these IPs are correct cuz I have a mail server. Now I can't even PING or Telnet the mail server. It would give me a Time Out error.

I go to the brower and enter »192.168.15.1 and it gives me an error webpage in RED.
I can still go to router's config page by entering »192.168.0.1

Can anyone explain me why?

Thx.

 

 

 

 

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