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LukeDouglas's avatar
LukeDouglas
Aspirant
Jan 12, 2016
Solved

Netgear WNDR4000 and Comcast Cisco DPC3941T problem

I have Comcast X1 service using a Cisco DPC3941T Wireless Modem.  This is located in my home office at one end of my home.  I have a Netgear WNDR4000 wireless router connected directly via Ethernet which is in my master bedroom at the other end of my home.  I have 2.4 and 5.0 wireless gateways working flawlessly on both.  The issue is that I have a 2TB USB Drive connected via USB to my Netgear WNDR4000 which I cannot access from my work computer in my home office which is directly connected into the Cisco DPC3941T modem in addition that I cannot log into the Netgear router from my work computer.

 

Using my laptop, I can access my Cisco admin panel on the modem when I am connected to either the 2.4 or 5.0 wireless SSID's on the Cisco modem but I can't access the Netgear admin panel.  When I connect to either the 2.4 or 5.0 wireless SSID's on the Netgear router, I can't get the Cisco admin panel or the USB Drive but I can access the Netgear admin panel as well as I can access the USB drive.

 

The IP address on the Cisco is local 10.0.0.1 and the IP address on the Netgear router is 10.0.0.2 (fixed - I tried DNS also but it picks up the same IP every time).

 

When my laptop is connected to one of the Netgear router's SSID's, it does not appear in the Network on my work computer.  When my laptop is connected to one of the Cisco modem's SSID's, it does appear in the Network on my work computer.

 

Basically, the Cisco is not recognizing the Netgear for networking purposes and the Netgear is not recognizing the Cisco for networking purposes.

 

I have reset the devices but to no avail.  Also, it is not feasible to plug my work computer directly into the Netgear router due to the physical distance between the two which is why I have it plugged directly into my Cisco modem since it is just a few feet away.

 

Does anyone have any suggestions on how I can get the two devices to be working on the same network so all connected devices can see all other connected devices no matter which one they are logged into?

  • LukeDouglas's avatar
    LukeDouglas
    Jan 13, 2016

     

    • Reset password          Save this for later just adds to the confusion
    • Setup Wireless SSID's (didn't want anyone nearby to log in)

    I don't either one of these is a big issue and, certainly, should not be an issue with viewing computers. If I didn't setup the Wireless SSID's, then I couldn't connect with my laptop to test the ability to view all computers from my work computer, no matter which SSID they are connected.

     

    Thanks for confirming that the AP mode disables all DHCP functionality.

     

    1. My laptop was recognized as connected (directly)    Connected to what?

    Sorry for the confusion.  When I go into my Cisco modem admin panel, it shows as a connected device.

     

    Is work PC USING VPN and connected to work? IF SO YOU CANNOT REACH LOCAL RESOURCES when using VPN

     

    Not connected to a VPN.  I have worked for myself for over 45 years.  Hate bosses. :)

     

    I did some pinging from my work desktop computer connected to the Cisco modem.

     

    Pinged Netgear Router (AP) 10.0.0.2:

    Pinging 10.0.0.2 with 32 bytes of data ;
    Reply from 10.0.0.252: Destination host unreachable.
    Reply from 10.0.0.252: Destination host unreachable.
    Reply from 10.0.0.252: Destination host unreachable.
    Reply from 10.0.0.252: Destination host unreachable.

    Ping statistics for 10.0.0.2:
        Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),

     

    Pinged Laptop when connected to one of the Netgear SSID's - IP 10.0.0.223:
    Pinging 10.0.0.223 with 32 bytes of data ;
    Reply from 10.0.0.223: bytes=32 time=266ms TTL=128
    Request timed out.
    Reply from 10.0.0.223: bytes=32 time=43ms TTL=128
    Reply from 10.0.0.223: bytes=32 time=479ms TTL=128

    Ping statistics for 10.0.0.223:
        Packets: Sent = 4, Received = 3, Lost = 1 (25% loss),
    Approximate round trip times in milli-seconds:
        Minimum = 43ms, Maximum = 479ms, Average = 262ms

     

    So it can't ping the Netgear AP but it can ping the Laptop connected to the Netgear AP.  Weird!

     

    I went back into my Windows Explorer on my desktop, clicked on the Network, and I can see the Laptop.  I'm not sure why I couldn't see it last night but I can now.  However, if I go into my Windows Explorer on my laptop, click on the Network, I cannot see my work desktop computer.

     

    So on my laptop computer connected wirelessly to the Netgear AP SSID, I did some pings.

     

    Pinged 10.0.0.1 - Cisco Modem:

    Pinging 10.0.0.1 with 32 bytes of data ;
    Reply from 10.0.0.1: bytes=32 time=18ms TTL=64
    Request timed out.
    Reply from 10.0.0.1: bytes=32 time=45ms TTL=64
    Reply from 10.0.0.1: bytes=32 time=174ms TTL=64

    Ping statistics for 10.0.0.1:
        Packets: Sent = 4, Received = 3, Lost = 1 (25% loss),
    Approximate round trip times in milli-seconds:
        Minimum = 18ms, Maximum = 174ms, Average = 79ms

     

    Pinged 10.0.0.252 - Work computer connected directly into Cisco modem:

    Pinging 10.0.0.252 with 32 bytes of data ;
    Reply from 10.0.0.223: Destination host unreachable.
    Reply from 10.0.0.223: Destination host unreachable.
    Reply from 10.0.0.223: Destination host unreachable.
    Request timed out.

    Ping statistics for 10.0.0.252:
        Packets: Sent = 4, Received = 3, Lost = 1 (25% loss),

     

    So I went back into my Laptop's Window Explorer (connected wirelessly to the Netgear AP), clicked on Networks and viola, I can see my work desktop computer connected directly to the Cisco modem.  Weird!

     

    So I went back and repinged both the Cisco modem as well as my desktop computer IP.  I got solid pings back!!!! Awesome.

     

    It appears that the network connection might be intermittent in reliability but why.  So I went into the Cisco modem admin panel and changed the firewall settings from Typical Security to Minimum Security.  Hopefully, this might help with the occasional dropping of connectivity (or viewability) for all of the computers.

     

    As of right now, I have the functionality that I was looking to have with my network setup.

     

    Thanks Searey.

     

     

     

     

     

     

11 Replies

  • Retired_Member's avatar
    Retired_Member

    A lot of details But one how is the 4000 connected to the crisco? It should be in AP MODE and connected to WAN port.

     

    • LukeDouglas's avatar
      LukeDouglas
      Aspirant

      The Cisco DPC3941T doesn't have a dedicated WAN port.

       

      I went into the Cisco admin panel, clicked on Advanced / Port Forwarding, clicked on the 'Enable' button and added a 'HTTP' service with server IP 10.0.0.2 as that was the 'fixed' IP for the router. Didn't work.

       

      I went into my Netgear admin panel and set the Port Forwarding.  Bad news..it did something bad as I couldn't get connected back to the admin panel, even being directly hooked into the router.  I had to reset the router and set everything back up.

       

      On my Cisco admin panel, I went to Connected Devices and added the WNDR4000 using the 10.0.0.2 IP address and it did add it to the Online Devices.  However, I still can't see my laptop that is logged into one of the wireless SSID's on the router.

       

      And I moved the USB from the Netgear router to the Cisco gateway but now I can't see it anywhere!

       

      Before Christmas this was setup with the one Netgear WNDR4000 router sitting near the Cisco and connected directly.  I had the ethernet cable connected into the nearby Netgear router that went to the Netgear router in the bedroom.  Everything was viewable.  But I get better internet speeds connected directly in the Cisco from my work computer.  Also, functionality over desirability. :(

       

      To be honest, there has to be some type of solution but, at this point, I've done a few hours of research and it seems that I am not the only person who has had these similar problems.  FYI, when I upgraded from my previous standard Comcast service to their X1 platform, I had the different setup and no problems.  Once they replaced the Gateway and my son changed the setup, I started to have these issues.

       

      I prefer to stay with my physical setup if someone can tell me how to get these devices to play nice with each other. :)

       

      Any other ideas?

       

       

       

      • Retired_Member's avatar
        Retired_Member

        I was talking about the WAN port of the 4000. I have comcast and a DPC3939 I have changed my setup more than I care to admit. 

        Listen up and you should have it working in five minutes. The dpc is the router preforming all the routing and 4000 is a Access point in AP Mode. 

        Disconnect the 4000 from the dpc ...push and hold reset until power led flashes then release, connect a cable to PC, after PC gets IP login and select AP mode. Once in Ap after the reboot disconnect from Pc and connect via cable to WAN PORT (YELLOW) and the lan port of DPC ( DO NOT USE PORT 4)  This is when the 4000 gets it's IP from the DPC DHCP server. 

         

        Log in to DPC go to attched List find 4000 select reserve IP this will ensure the 4000 gets same IP so you can log in to it and change the settings.