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Wireless Router Won't Obtain an Internet IP

by Tolroe / July 14, 2010 4:24 AM PDT

I recently purchased a new Cisco E2000 router and updated it with the latest firmware. When I set this up at home I was able to connect to all computers on my LAN, but did not have an internet connection. I tried renewing the IP on the router, but could not get an internet IP. I called my ISP and they reset my modem which allowed my new router to obtain an IP and I had internet for a short period of time. When my DHCP lease is up the router does not renew the IP and I lose the interwebs. I've tried manually renewing the IP and can't obtain a new IP unless I contact my ISP and have them reset the modem. If I connect my old wired router, however, it immediately gets an IP and renews the IP properly. Any idea why I can't get my new router to properly obtain an internet IP?

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This is known for most cable modems.
by R. Proffitt Forum moderator / July 14, 2010 11:32 AM PDT

You can't move the ethernet cable from the modem to the other router without a reset. This is well known and I decline to document it here.

But I found most of the time I can power down the cable modem, move the ethernet cable and power up the cable modem to get it to work.

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Power down
by Tolroe / July 14, 2010 12:06 PM PDT

I did power down the modem first. Any ideas why when trying to renew the IP the router does not obtain an address?

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by R. Proffitt Forum moderator / July 16, 2010 12:07 AM PDT
In reply to: Power down

But it does not matter that I know as that will not fix the issue. If the ISP has set up their system to require you call in for a reset there is only ONE solution. PLEASE don't take this wrong but duplicating the web on why is not going to do anything but have me type a dissertation. Let's move on.

Here's the workaround. CLONE THE MAC ADDRESS of the machine that works to the router. No step by step is offered but here's a web link about how to do this on some routers ->

By doing this you avoid having to call in for the reset.

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I have tried both with no success
by Tolroe / July 16, 2010 7:21 AM PDT
In reply to: Yes.

Perhaps I wasn't clear enough in my original post, but I did call and have my ISP reset my connection, twice. And before that I tried cloning the MAC address, neither solution worked. I did get a connection each time I called in and had them reset it, but it only lasted for about an hour (when my lease ended it didn't renew).

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Then we are down to
by R. Proffitt Forum moderator / July 16, 2010 7:50 AM PDT

A bad isp or a bad router or a bad ethernet cable.

Change what you have fix.

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