Windows 7, cable modem, DHCP

Discussion in 'Windows 7' started by floriancj, Oct 5, 2009.

  1. floriancj

    floriancj MDL Novice

    Jul 30, 2009
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    I have Windows 7 and I am connected to Internet (ISP is UPC Romania) through WebSTAR EPC2203 cable modem. IP and settings are obtained from DHCP and lease time is 2 hours. When I shutdown the computer and I restart it after 2 hours (after lease expiration) I have only local access. If cable modem is restarted, I can access Internet.

    I have same problem on Vista SP2.

    Does anyone know what the problem is and how to fix it?

    Thanks in advance!

    P.S. Firewall is on (defaul settings).
     
  2. oxyblue80

    oxyblue80 MDL Novice

    Aug 31, 2009
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    so u have no internet access at all unless you power cycle (reboot) the modem?
     
  3. guig

    guig MDL Member

    Apr 15, 2008
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    You can just try to disable network interface card and enable it again. Problem is related with DHCP adress request. When you reboot cable modem it resend DHCP control value to all connected devices with MAC adress. Allways you can try to run cmd and type ipconfig /renew
     
  4. oxyblue80

    oxyblue80 MDL Novice

    Aug 31, 2009
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    or ipconfig /release
    then
    ipconfig /renew
    to for sure refresh it

    also if u don't have a router and are switching between computers with different MAC addresses the cable modem usually will need to be power cycled to refresh the MAC address it is associated with..
     
  5. guig

    guig MDL Member

    Apr 15, 2008
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    I agree :)
     
  6. floriancj

    floriancj MDL Novice

    Jul 30, 2009
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    Yes, no Internet access at all, unless modem is rebooted.
     
  7. floriancj

    floriancj MDL Novice

    Jul 30, 2009
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    ipconfig /renew doesn't work.
    It's annoying to enable/disable network interface and my wife is not a computer specialist :D She doesn't know to do that everytime computer is started and she wants to check her e-mail.

    Any other solution, without restarting/enabling/etc?

    P.S. Thanks to all for answers.
     
  8. Mr Jinje

    Mr Jinje MDL Expert

    Aug 19, 2009
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    Switch to ISP plan that allows for longer IP lease. The problem is not your computer, or your cable modem, it is the ISP only allows you 2 hours at a time.

    Otherwise the only fix is to reboot your cable modem every two hours.
     
  9. Servi

    Servi MDL Member

    Aug 12, 2009
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    Why don't you use a multiple outlet strip with a switch? So you can turn off and turn on PC and modem at once, and save some energy.
     
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  10. guig

    guig MDL Member

    Apr 15, 2008
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    Hm... I am not sure if this will help but you can do. Try to set a static IP, subnet mask, default gateway and DNS adress from the same adress class which you get from your ISP. I could not work due ISP sets default route dynamically to the DHCP assigned adresses...
     
  11. tazman137

    tazman137 MDL Junior Member

    Jul 17, 2009
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    buy a router and leave that on all the time, that will keep your IP active with your ISP.
     
  12. floriancj

    floriancj MDL Novice

    Jul 30, 2009
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    Peoples are inventive... :)

    Last question: it's a Windows problem or problem is caused by ISP?
     
  13. Servi

    Servi MDL Member

    Aug 12, 2009
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    His problem starts when his PC has been switched off and on again. When the PC is switched off, he can switch off the modem as well, can't he? Well, maybe this solution is too simple and too logical...
     
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  14. MrFerretKing

    MrFerretKing MDL Member

    Aug 25, 2009
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    Easiest way and pretty cheap (especially if you get a used one off a buddy)

    You wont have to worry about resetting your cable modem each time, the router will take the ISP DHCP lease each time it is renewed.


    Depending on the ISP you may have to go in the router options and do a "MAC Clone" if you cannot gain inet access when first hooking all hardware backup.



    Mfk
     
  15. Mr Jinje

    Mr Jinje MDL Expert

    Aug 19, 2009
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    Floriancj, tell us if the 2 hour IP lease is for your public or private IP address. If the lease is for your public IP Address, then the problem is your ISP is only giving you a 2 hours lease. If the lease was for your private IP, then IPCONFIG or rebooting your machine should have cleared the issue.

    Maybe is time to call up you ISP and ask them what is deal. Otherwise, Ferret makes a good point about cloning MAC addresses, if that could be the issue.
     
  16. NTurky

    NTurky MDL Novice

    Aug 1, 2009
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    Well, I have some Scientific Atlanta Webstar DCP2100R2.
    It always worked flawlessly until a few weeks ago. My ISP lease time was 24 hs. At 8 AM aprox the modem resets and take a new IP.
    I´m using a Linksys WRT54G2. It always worked flawlessly too (btw, Scientific Atlanta = Cisco, Linksys = Cisco).
    But now, the modem won´t give me internet access until I reset it by unplugging the power cord or press the reset button for 10 secs.
    It I check in the router, everything is fine. I do a DHCP release and renew. It takes a correct IP, Gateway, DNS, everything! But I have NO internet access.
    It´s the same if the modem is connected directly to the PC. And no matter if I leave some Bittorrent running or nothing at all.
    I know quite a few ppl having the same problem.
    So, the f*****g ISP is doing it on purpose.
    When you phone to support they mock on you.
    I´m so tired of this that I´m gonna switch to another company.
    Wish you luck.
     
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  17. Gethsemane

    Gethsemane MDL Member

    Aug 28, 2009
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    I would suggest getting a Linksys Cable/DSL Modem-Router combination and then just install dd-wrt on it if you can. It should have some way to automate the DHCP renewal. You would have to research it. Best bet is to just call up the ISP and ask what the f**k their problem is. Be assertive. You are the customer. They must want your money.
     
  18. NTurky

    NTurky MDL Novice

    Aug 1, 2009
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    Sadly that´s not true in this s**tty country of mine :(
    I read a lot about DD-WRT and wanted to try, but in my router is not an option right now because there is no turning back.
     
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