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Wireless devices are connected but can't get to internet?

All of sudden, All wireless devices were not getting to websites via ARRIS TG863G gateway.
It was fine until yesterday afternoon.

Comcast gave me this ARRIS TG863G Gateway which provides
Ethernet cable connection, wireless connection and telephone service.
I have no problem getting to internet via Ethernet connection going thorough the same box.(Wired connection is OK)

I ran the network diagnostic from MacBook (Wireless device) and it showed Wi-Fi, Wi-Fi setting, Network Settings and ISP are OK but Internet & Server are NOT.

I have rebooted this box a number of times but it did not make any differences.

With another wireless network connection like xfinitywifi (Xfinity Hotspot), Wireless devices are doing fine. No problem at all.

Does anyone have any ideas what I should do to fix this problem ?
At this point I do not want to reset it to a factory setting yet.

Thanks for you help in advance.
5 answers Last reply Best Answer
More about wireless devices connected internet
  1. Check the admin console and make sure that the LAN IP address space is not too small for the number of client devices attached to the AP. There are a few other points of failure here that may come into play, but we would need a lot more info about the network setup to make any kind of call.
  2. The_Prophecy said:
    Check the admin console and make sure that the LAN IP address space is not too small for the number of client devices attached to the AP. There are a few other points of failure here that may come into play, but we would need a lot more info about the network setup to make any kind of call.
  3. I am having a problem with even one wifi device.
    And I have no way of kinwing how space is given for wifi device.
    In case you need know that

    IP4 configuration seems OK and IP6 is enabled.
    LAN ip6 address assignment is stateless(Auto config) and From ISP (auto config). I guess it's all auto config.

    I hope you get better idea and please let me know if you need to see any other info.
    Thanks.
  4. Best answer
    We need to know how many internal IP addresses the router can assign, not how it is assigning them.

    I've tried to find the manual for the gateway model you posted above, but unfortunately it has turned up nothing. I would say your ISP is likely better equipped to help you here.
  5. I swapped this box with New one. Problem solved.
    When I called Comcast first time, they transfer my call to Tech support 2 where they would not do without charging me $75.00 which I declined.
    I called again (3 more time) to go through the same procedure for the people who do not have much of technical knowledge.
    Finally, the last guy agreed to swap the box.
    This kind of problem is beyond your control and they should NOT try to charge for their own device misconfiguration/malfunction.
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