What are you trying to do with the repeater? The repeater should only function to locally increase your wireless signal, it does not provide DHCP addressing or act as a gateway.
Consult your manual, but basically the repeater should have an ip address assigned that is within your network range, but not one that will be assigned by the DHCP server in your gateway router. For example if your gateway is 192.168.0.1, allow the DHCP to assign 192.168.0.2 to 198.168.0.50 and assign the repeater a static address of 192.168.0.51.
You may be trying to make a wired connection to the repeater to set it up, if so, the computer you connect will have to be in the same network as the default repeater address, so give your computer a temporary static address of 10.0.10.253 while connected to the repeater. Then when you type in the repeater address into IE you will get the configuration page.
The bottom line is that for devices to work on the same network, they must have addressed in the same network range (or be bridged, which you don't need).