WRN3500L cable modem issue - no IP

Discussion in 'Tomato Firmware' started by _wb_, Nov 7, 2011.

  1. _wb_

    _wb_ Networkin' Nut Member

    I have a WRN3500L that I flashed with dd-wrt then tomato 1.28.4407 MIPSR2-Toastman-VLAN-RT K26 USB VPN+NOCAT. I erased and did a 30/30/30 but I am UNABLE to get an IP from my cable modem. I tried connecting another router to the cable modem and the IP is shown almost automatically. I see that my WAN has DHCP enabled but the Netgear router can't get an IP. Toastman mentioned he only deals with ADSL but I have a cable modem connection. Does anyone know how to fix this issue?
    Any help is appreciated!
  2. lancethepants

    lancethepants Network Guru Member

    I seem to remember that some cable modems like to bind to the mac address of the first device connected. When I helped a friend with this, all we needed to do was to reset/power cycle the modem, and then it would correctly bind to the router.

    On a side note, my friend first had his computer directly plugged into the modem, and the computer had his wan ip. Then he introduced a router to share the internet with multiple computers, but it went right through the router and found that same computer, bound to it's mac address, and still just gave that computer it's wan ip, until the power cycle/reset, whatever it was we needed to do.
  3. _wb_

    _wb_ Networkin' Nut Member

    @lancethepants: I did reboot many times both the Netgear and the cable modem, but it does not get an IP, but as soon as I plug back the old router I have an IP from the cable modem. I did an ifconfig on vlan1 which looks like is the wan port but I see no traffic. Not sure what else to do here.
  4. Toastman

    Toastman Super Moderator Staff Member Member

    As I said, I know nothing about cable. But I seem to recall some advice that said to leave the modem switched off for a period (30 mins??) before restarting it, so the ISP will drop previous record and pick up the new router. Others clone the old router's MAC address on the new router, so the ISP is not aware of any change.
  5. _wb_

    _wb_ Networkin' Nut Member

    @Toastman: I did set the tomato router to have the same Mac address as the router that gets an IP from the modem and it was able to get the IP then on the tomato router, but I am unable to access the internet for some reason.
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