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The general idea of setting up a router as a range extender for your main WiFi router's area of WiFi coverage, can be summed up in these particulars:
1. set it as a WiFi router too.
2. set it up largely the same as the main router - same SSID, same WEP or WPA or PSK or other wireless encryption type, and the same wireless passphrase (commonly known as a 'wireless password').
3. but, set it up with DHCP *disabled*, so that only the main router can supply DHCP service to devices. And, set it up with a fixed-IP address of its own, that is near the top of the main router's address range.
(For instance: suppose the main router has an IP Address, locally (to be found out by looking for the Default Gateway address of any computer connected to it) of
just to name a rather odd set of values. The '2' and the '23' are the crucial part.
The 'range' of the main router in this case, would be from
or some such. In which case, you should assign the range extender or secondary WiFi router, to a fixed IP address of
or some such.
Here's a vague guide, also to the general facts of range extender setup:
Remember that, in configuring a range extender, one has to set it to the same SSID as the WiFi router one is trying to extend.
And also, the encryption code must be the exact same type (not just WPA, for instance, but if the main router is WPA-PSK, then the extender must be WPA-PSK too. This requirement may even extend to revision level, so if a router is very new and an extender is much older, it may not work.
Another point: range extenders must actually be within range of the main router. So check on that also, by trying to access the main router (after turning Off the range extender altogether, and unplugging it) from that same position with a wireless-equipped laptop, and see if it has a reasonably strong signal, of at least two bars I would recommend (though only one green bar *might* work reliably.)
Let me know how it goes, and what you find out, please. Thanks.