Ok, but can it be used with cable, to extend the wifi?
router1 DIR-855 wifi ---cable---> router2 dir-655 wifi, as an exten range via cable
Works fine as an access point connected to a D-Link DGL-4100 wired router:
cable/dsl modem --> DGL-4100 --> long cable --> (
LAN port) DIR-655
long cable can be up to 300 feet, preferably cat 6.
Whether the main router is wifi or not shouldn't matter, as long as the radio signals don't conflict.
My settings, which may or may not be required for it to work:
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DGL-4100 setup:
BASIC, NETWORK SETTINGS:
Router IP Address: 192.168.0.1
Subnet Mask: 255.255.255.0
Enable DNS Relay: UNchecked
Enable RIP: UNchecked
ADVANCED, GAMEFUEL:
Automatic Uplink Speed: UNchecked
Manual Uplink Speed: set to your ISP uplink speed
Connection Type: NOT Autodetect (xDSL or Cable, depending on your ISP)
ADVANCED, ADVANCED NETWORK:
Enable UPnP: UNchecked
Enable Multicast Streams: UNchecked
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DIR-655 (1.21 FW, A4 HW) setup:
SETUP, NETWORK SETTINGS:
Router IP Address: 192.168.0.201 (anything between 201 and 254 is fine)
Subnet Mask: 255.255.255.0
Enable DNS Relay: UNchecked
Enable DHCP Server: UNchecked
ADVANCED, ADVANCED NETWORK:
Enable UPnP: UNchecked
Enable Multicast Streams: UNchecked
ADVANCED, QOS ENGINE:
Automatic Uplink Speed: UNchecked
Manual Uplink Speed: set to your ISP uplink speed
Connection Type: NOT Autodetect (xDSL or Cable, depending on your ISP)
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Tricky part is both routers have the same IP (192.168.0.1) at the start. You can only connect one router at a time to your network until they've been changed so they're not the same.
What I did is remove the other router from my network, connect the DIR-655 (LAN port only), change it's IP and disable it's DHCP Server, Save settings and reboot it. (You could also do this by connecting just 1 PC to the 655's LAN port and changing it's settings before connecting it to your main network.) Then I reconnected both routers and tweaked all the settings.
If I was doing this with a wireless main router, I'd disable it's radio until I got the DIR-655 working as an access point, then reenable the radio on the main router and make sure the radio signals don't conflict.