Router won't grab IP from ISP

anths

Limp Gawd
Joined
Jun 14, 2001
Messages
491
After bringing my router down to my house from college, it won't grab the IP from the ISP. It is a WRT54G. It has the freeman basic 1.0.4 firmware on it all set to stock options. I have plugged and unplugged the cable modem/router/turned off the pc in every order possible and tried everything else I can think of. The router is working fine, I can log into it to change settings, it just wont grab an IP. Renewing IP doesn't do anything, it just leaves 0.0.0.0 as IP/subnet mask/gateway. Any suggestions? Getting a little frustrated with this...
 
DSL or cable?


If DSL, possibly the sign ins being done on the modem?
if cable, uh, sorry, no idea!
 
Stupid question but did you release the address on the pc when you disconnected?? if not your ISP may still be holign the mac address from the last connection. Easy way around that is to either clone the mac address of the last device connected. Or reconnect the last device and release the ip before disconnecting.
 
Yeah cable...either do the mac clone trick in the router, or....power off the cable modem for at least 15 minutes....with the router on...power up the modem. After a couple of minutes, recycle power on the router. The modem should by now have learned the MAC of the router and handed a WAN IP.
 
I tried both the MAC spoof trick and the turning off the modem for an hour trick; still not getting a WAN IP. Any other suggestions guys? This seems so simple, don't know why I can't figure it out!
 
I can hook the modem to any direct PC and it will grab an IP. It also hands out LAN IP's, it just doesn't get a WAN IP from the Cable Modem. I just reflashed a fresh copy of freeman basic 1.0.4 and it didn't do anything. Maybe flashing back to stock drivers will work? I'd like to fix it before resorting to that if at all possible.
 
anths said:
I tried both the MAC spoof trick and the turning off the modem for an hour trick; still not getting a WAN IP. Any other suggestions guys? This seems so simple, don't know why I can't figure it out!


Call your ISP. maybe they still have to do something on their end before you try more steps
 
Called them - they haven't a clue. Is there anyway to tell this router the IP of the DHCP server of the ISP? Every function on the router is working just fine except it isn't grabbing the IP! another curious thing. I cloned the main computer's MAC address, set it up for static IP and input the IP/gateway/subnet/DNS servers to the router exactly as it was on the computer - still nothing!
 
anths said:
Called them - they haven't a clue. Is there anyway to tell this router the IP of the DHCP server of the ISP? Every function on the router is working just fine except it isn't grabbing the IP! another curious thing. I cloned the main computer's MAC address, set it up for static IP and input the IP/gateway/subnet/DNS servers to the router exactly as it was on the computer - still nothing!

ok what brand of modem do you have and does it allow multiple computers on its own. Did you have a router before. I looked through the posts and didnt see it mentioned. Also what ips does your modem hand out? are they 192s or public.
 
The only steps you should have to take when hooking up a new device is to.

1.) Power down modem, and router.

2.) Turn on modem, and wait till it gets sync, then power up the router.

There is no need to clone macs on Adelphia's network.

Seeing how thats not working, could it be possible that the ethernet cable you are hooking up between the modem, and router is bad? If you have not tried yet, I would try another cable.

If its not working when you statically assign the IP settings it may be a problem with the router. Perhaps try another firmware version.
 
Gertrude said:
The only steps you should have to take when hooking up a new device is to.

1.) Power down modem, and router.

2.) Turn on modem, and wait till it gets sync, then power up the router.

There is no need to clone macs on Adelphia's network.

Seeing how thats not working, could it be possible that the ethernet cable you are hooking up between the modem, and router is bad? If you have not tried yet, I would try another cable.

If its not working when you statically assign the IP settings it may be a problem with the router. Perhaps try another firmware version.


Ditto!

I'm the Network Admin for a Local Cable ISP and this is the only thing you need to do on our system. (Adelphia's as well, I had adelphia for the longest time.)

When the modem comes online, the last thing it does is grabs the MAC address of the device its connected to. It will hold that MAC address untill it is power cycled.

In your situation, it sounds like you have a bad router or firmware. (I've had a few linksys routers do this before.. actually about 5 (of my own))
 
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