WRT54GS not issued IP address by cable modem

Discussion in 'Networking Issues' started by hossfeathers, Dec 22, 2007.

  1. hossfeathers

    hossfeathers LI Guru Member

    I'm on comcast and today something happened with their network, apparently, tho on the second call to tech support they said they had no record of what the first contact person said.

    Since then I am not able to get my WRT54GS back online in any meaningful manner. I had a more complex setup where a dlink DFL-200 ( was the first router off of the cable modem, handling some public facing test servers, and the WRT54GS ( was off the dlink, handling LAN stuff. But after everything stopped working I've removed the dlink and have the WRT54GS connected on it's internet port to the cable modem (because the dlink router software is so awful, and the linksys software is pretty good, and because I have had such good luck getting useful feedback from linksysinfo people). But the WRT54GS does not seem to acquire an IP address from comcast. The dlink had the same issue. I have unplugged the WRT for two hours; hit the reset button for 15 seconds; and the IP address ion the Status page (linksys firmware ver 4.71.1) is always I expect it to get a real ip address from comcast.

    I've tried the DHCP Release and DHCP Renew buttons numerous times; is all I get.

    I was on the phone with comcast tech for a while re this issue; the cable modem and the connection seem ok.

    This WRT54GS is one of the early ones, ver 1 or something, if I recall.

    I'm able to write this because I connected the cable modem to my workstation directly; and thus I get a valid comcast ip address and can connect to internet. Am I missing something basic? What should I try next?
  2. hossfeathers

    hossfeathers LI Guru Member

    I have made a bit of progess with this...I need to power cycle the cable modem whenever changing the downstream device. I can get the WRT54GS to work if it's connected to the cable modem. The dlink dfl-200 router still does not seem to relate to the cable modem if it's first in line downstream.

    Does anyone know how to find the external ip address of the dlink dfl-200 via the interface? It's so easy with the linksys.
  3. ifican

    ifican Network Guru Member

    As a general rule whenever you change the first device behind a cable modem you will need to reboot the cable modem for it to work, i know you said that already but that is to clarify. So if you connect the dfl-200 to the cable modem , reboot the cable modem then the dfl it does not get an ip? But if you plug the dfl into the linksys lan it does?
  4. hossfeathers

    hossfeathers LI Guru Member

    Yes, exactly...I'm now on the linksys wrt54gs; got there by power cycling the cable modem and using the wrt as the sole router. If I do the same with the dfl-200, it does not allow me to connect to the internet. I am guessing that this is because the dfl-200 is not getting an external ip address from comcast to work with. But I'm not sure because the incredibly awful software that dlink gives you to work with that firewall/router does not seem to offer the external ip addr anywhere like the linksys software does.

    I've tried resetting the dfl-200; though not to factory defaults yet; and powered it off for 8 hours.
  5. hossfeathers

    hossfeathers LI Guru Member

    Does anyone have suggestions re this situation?
  6. PeterT

    PeterT Network Guru Member

    Looking through the DFL-200 manual seems to imply that when you connect to it, the IP information should be available on the STATUS / INTERFACES and then select the WAN tab.
  7. hossfeathers

    hossfeathers LI Guru Member

    Thanks that is where the wan ip address info is shown.

    It's been a week or so since I tried both routers in the cable modem-dfl-200-wrt54gs- config and this time everything just worked. All I did was power down the cable modem, remove the wrt54gs from it's temp role as sole router, hook up and power on the dfl-200, test that had an ip from comcast, connect to internet from it using pc; connect the wrt54gs wan port to a dlf-200 port, release/renew the wrt54gs internet ip address, then move pc connection to the wrt54gs, reboot the pc.

    What made the difference? This is exactly what I did many times a week or so ago. Was it the length of time that the dfl-200 was powered off? The obvious 'difference' was that the wrt54gs was able to get an ip address from the dfl-200, but why wasn't it able to before?
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