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I attached a new modem to my system today. Now, if I run my system through my router I cannot connect to the internet.The cable people says my computer is running on the router ip address and thus I cannot access the internet. How do I fix this and still run my system through the router? Thanks in advance.

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This can be complicated...eveything in your system has an IP address including the router itself. Try using your old router..if it works, then you have an IP adress issue with the new router. Also,
the routers use a scheme called the 802.11 IEEE standard. There are variations on this called 802.11a,b,g,n,etc. Not all devices will work with a 802.11n system...it is still to new. Try using the 802.11g
instead...also most routers use a system called dynamic IP addressing. This means the router automatically signs an IP address to everyuthing in your system...this can change with the addition or deletion of any device in your system...Jeff

Posted on Oct 03, 2010

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Is this a new router - or should I say did you only have the one computer hooked to the modem until now? Some ISPs use the MAC address of the installed PC to assign the network IP address. Since the Router will have a different MAC address, the modem will not recognize it. ISPs use this as security, but it makes networking impossible. However, most routers have a feature called MAC spoofing, which allows the Router to fake the modem into believing it is the computer originally attached to the modem. On newer routers this is a feature that can be automatically done during the setup wizard. You need to have the original PC hooked to one of the router ports (not WAN or INTERNET) and when the router asks you if you want to use the MAC spoof, say yes.

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Each network adapter (in the Linksys router, or in your computer) has a unique 12-character code. Some ISPs (Internet Service Providers) will require you to "register" this 'MAC' (Media Acquisition Control) address, before they grant an IP-address to the device (router or computer). So, when you "bypass" the router, you're showing a different MAC-address to the ISP, and they are not allowing that MAC-address to get connected. Talk to your ISP.

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1 Shut off computers, routers, everything.
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After that, turn on any other routers, and the computers...
This should allow you access to the net by any of your computers because the wifi router should give all the other comptuers and routers on the system inddividual ip addresses and all should be well...
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I have experienced this many times with people who didn't cycle the modem off and on when adding a router, or taking one out of the system - making the hardware appear 'attached' but giving the PC's 'limited or no connectivity'.

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