This article doesn’t show you how to turn it into a repeater (your router must support network bridging for that), but I figured I’d put both names in the title in-case you’re unfamiliar with the differences in terminology.
Repeater: A device or advanced router that will retransmit the signal from another wireless router.
Access Point: A router (connected to your original
network) that broadcasts an entirely new signal, but connecting to it
will allow you to access the original network.
(The following assumes that you already have your modem and router set up, and would like to extend the wireless coverage)
Step 1: Plug in the new router (the one you will use
as the access point) to a electrical outlet, and use a straight-through
network cable to hook your computer up to it in one of the LAN slots
(1-4). Note: Do not connect the new router to anything else just yet. That will come in later steps.
Step 2: Under ‘Network Settings’
Change the IP address of this new router so it is in the same subnet
as the main router (I changed mine to 192.168.0.2), but make sure it
does not have the same IP address as the main router.
Note: After doing this, if you type 192.168.0.1 in your browser
it will direct you to your main router, and 192.168.0.2 will direct you
to this new access point
Ensure it has the same Subnet Mask as the main router (255.255.255.0)
Disable DNS Relay
Disable DHCP Server
Step 3: Under ‘Wireless Settings’->’Manual Wireless Network Setup’
Give your network a name. This can be the same as your previous
wireless network or a new name. My original router is broadcasting as
‘dlink’ and I called this one ‘Chris’
Set up some sort of security if you would like.
Step 4: Reboot your new router to save all the
settings. Now take a straight-through network cable and connect the two
routers. Plug one end into the LAN of the main router (spots 1-4),
then plug the other end into the LAN of the new access point (spots 1-4)
Do not plug it into WAN of the new access point!!! Although this seems logical, it does not work.
Step 5: Connect to your new router and bask in the glory.