You could attach two routers together to extend your range.
1- Connect the 2nd router in LAN port of the first router. Use a cross-over cable.
2- DHCP range of 1st router = 192.168.1.x to say 192.168.1.10
3- DHCP range of 2nd router = 192.168.1.12 to say 192.168.1.20
4- IP of 2nd router = 192.168.1.11 (so that it doesn’t fall in same DHCP address space as assigned by 1st router)
5- Put both routers on separate channels.. 1,6 or 11 (If Router1 is channel 1… give Router2 channel 6 or 11.. that way…)
Rest configure second router as you would configure your primary router…
As an alternative keep your ADSL modem as 192.168.1.x, first router as 192.168.2.x and third as 192.168.3.x
Gateway for Router1 will be modem IP (i.e. 192.168.1.1) and Gateway for Router2 will be Router1 IP (i.e. 192.168.2.1)
Enable DHCP on both and your set!
http://www.techenclave.com/networking/large-home-network-with-two-routers-121473.html
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Or.
You could use one router to set up a 2nd network and wireless access point by simply connecting the WAN port of this router to one of the LAN ports on the main one and use a different network or subnet and broadcast the WiFi on another channel. Computers in the house could access the Internet from which ever access point provided the best signal, but the computers on the different networks couldn’t communicate with each other unless the networks were bridged.
Connect from 1st router lan out port to 2nd in router lan port. Configure 2nd router for no dhcp and give it a static ip for management. It is now a wireless access point
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More articles:
http://www.ehow.com/how_5815128_connect-routers-one-dsl-line.html
http://www.ehow.com/how_6512208_use-wrt-router-expand-network.html
http://www.ehow.com/how_4527815_two-routers-one-home-network.html