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Change modem I want to chage my modem... when i change my cable modem i cant access the internet... i think it has something to do with ip address... since when it acquiring network address it says something like invalid ip address.... its dhcp... with the old modem (rca dcm 245), which i get access to internet, it gives me an ip address 10.x.x.x and with the new one (arris) the one that doesnt gives me access it has a 169.x.x.x.... maybe changing the ip address would help? or what can i do??? thanks in advance!!

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  • alejoser23 Dec 29, 2008

    already did all that... the isp doesnt really help:S:S... i want to do this without calling them... is there any way??

  • alejoser23 Dec 30, 2008

    Yes I undestand that... The reason im trying to change the cable modem it´s because im trying to put wireless in my home and i called linksys and they told me the my actual modem the rca dcm 45 works on class b and that it´s a router modem which is not compatible with the linksys router which works on class b.... The reason i dont want to call it´s becuase i want to be sure that changing the modem will really solve the wireless problem... and this arris modem someone lend it to me.... that´s why i´m trying to call the isp as my last resource, because then if thats theproblem i would buy my new modem and call them again??.... thank you very much, for trying to help me....

  • alejoser23 Dec 31, 2008

    thank you!! it´s a linksys wrt54g2...i called linksys and thats what they told me... but i wanna be sure before doing something else...

  • alejoser23 Dec 31, 2008

    Dman.. thank you so much.... that fixed the problem... that´s the last thing i waould had even imagine would solve my problem.... thank you so much...!!! Thank you so much!!! I´m actually right now in my laptop with wireless!!! thankss!!:):):):):):D:D:D:D:D:D:D... May God bless you this new year 2009 and his blessings in your life and family....

  • alejoser23 Jan 02, 2009

    Just one thing? what´s the problem wth the rca modem? why did i had to put one foot away from the router and that fixed the problem??

  • alejoser23 Jan 07, 2009

    :O... i see.... thanks....

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  • 27 Answers

Hello,

First, I would try resetting the modem by unplugging for 10 seconds or so and then plugging it back in. To be on the safe side, I would also reboot computer. AFter that, I would try to see if it picks up valid ip address. If it doesn't, you may need to call your cable internet provider and perhaps get the mac address of your modem in their system (if it's not already)

Dman

Posted on Dec 29, 2008

  • 2 more comments 
  • dmantek Dec 29, 2008

    Hello,

    I understand you want to do this without calling them. However, when you change from one modem to another, you usually have to setup or provision the new modem with your ISP. It wasn't clear whether you called to get it provisioned or whether you just called to get help with them. Even the Arris website says this about provisioning:





    "I just purchased a new ARRIS cable modem, what do I have to do to get my modem to work?


    Anytime you replace one cable modem with another, or hook one up for the first time, you need to contact your cable internet provider so that they can provision (set-up) your new modem to work on the cable network"



    Another thing you can check (if you haven't already) connecting directly to pc instead of a router and see what happens.

  • dmantek Dec 30, 2008

    I have done more research on this problem you are having and I don't think the problem is that the modem is not compatible with the router. Can you tell me what router model you have?

  • dmantek Dec 31, 2008

    Hello,



    This may sound dumb, but can you try something for me. Please make sure that the cable modem (rca dcm245) is about a foot away from the router. I did research and there is a known problem with shielding with this modem, so modem should not be too close to the router.

    Let me know what lights are on the router and if they are solid or flashing.

    Let me know what lights are on the modem.

    Problems are not always fixed instaneously so I appreciate hangin there with me. I would try working with the old modem first before getting a new one.



    Dman

  • dmantek Jan 07, 2009

    I am glad that solved the problem. The reason why the modem had to be about a foot away from router is for some wireless shielding problem. If it is too close, it would have some wireless interference or something like that.

    dman

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If your broadband modem does not have PPPoE function, select the 'PPPoE' option in the router and enter your account details (username and password given by your ISP). Note that some ISP's require username to be as your full e-mail address (ex: username@ispname.com).

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Click on SAVE SETTINGS and then on REBOOT THE DEVICE to apply the new configuration. Recycle power to modem.

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If you did not have to run PPPoE login client on your computer when modem was directly connected to your PC, your ADSL modem has PPPoE built-in. In this case set the router's WAN (INTERNET) port should be set to the 'Dynamic IP' option.

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Configuration steps:

Step 1 Connect the cable modem to the WAN (INTERNET) port of your router. If the modem has USB connection make sure that it is NOT connected to any computers via the USB cable and that the modem is switched to Ethernet (not USB). Only the modem's Ethernet port should be connected to the router's WAN (INTERNET) port.
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Step 2 Open your Internet Explorer and log into your router by typing in its IP address (in most cases the default IP is http://192.168.0.1 ). Note that you do not have to be on the Internet in order to access this address because you are just connecting to your router's address. Specify username and password for your router, default is `admin' and password is blank (nothing).

Step 3 After logging into the router select Setup. Set Internet Connection to 'Dynamic IP (DHCP)' option.
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