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Welcome!What Hardware version is your router? Look at sticker under router.
Link>What
Firmware version is currently loaded?
What region are you located?
Are you wired or wireless connected to the router?
Some things to try: - Log into the routers web page at 192.168.0.1.
Setup DHCP reserved IP addresses for all devices ON the router.
Ensure devices are set to auto obtain an IP address.
What firewall settings are being used currently.
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Wireless Installation ConsiderationsWhat wireless modes are you using?
Try single mode G or N or mixed G and N?
Channel Width set for Auto 20/40Mhz or try 20Mhz only.
Try setting a manual channel to a open or unused channel. 1, 6 or 11. 11 for single mode N if the channel is clear.
What security mode are you using? Preferred security is WPA-Personal. WPA2/AES Only. Some WiFi adapters don't support AES, so you might want to try TPIK only or Auto.
What wireless devices do you have connected?
Any cordless house phones?
Any other WiFi routers in the area? Link> Use InSSIDer to find out. How many?Turn off all anti virus and firewall programs on PC while testing. 3rd party firewalls are not generally needed when using routers as they are effective on blocking malicious inbound traffic.
Turn off all devices accept for one wired PC while testing.
Also make sure the phone lines and signal on the lines are in good condition and filtered correctly if needed. Ask the ISP to verify signal line levels.