Why doesn't my Dynamic IP address ever change

March 5, 2010 at 03:05:59
Specs: Windows XP, 2GB

I can't get a new ip,i have the same ip every times when i check,and when i contacted with my ISP,after 1 minute they said me,i have dynamic ip. Then I got a new IP only once when my ISP check me,and this new ip does not change anymore,so i have the same problem after contacting with my ISP,i think the problem is at my ISP but don't know what is the problem and i am not sure.

I tried some trick to change my ip,but failed: 1. ipconfig/release - ipconfig/renew 2. ipconfig/release - reboot pc 3.Reboot modem 4.Local Networks - TCP/IP - obtain ip... tried to obtain another ip...etc

I have "Cisco EPC3000 Cable Modem" my internet run on Tv cable,i have Windows XP SP2,My internet connection:Always active, so you do not need to log in,speed:25-30mb Broadband.
Please help!

Best Regards:John

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March 5, 2010 at 07:38:34
I don't see this as a problem. People pay extra for an IP address that never changes.

The reason it never changes is simply down to the way the ISP has it DHCP server configured. It is fairly common to get the same IP address back when you renew especially if the ISP is working with a limited address pool. There is nothing you can do about it as it is entirely down to the ISP as to how they configure their DHCP server.

You don't mention a router so I am assuming that the IP address you are talking about is your public IP address. If you are behind a router then ipconfig only effects your private IP address which is a different thing altogether.


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March 28, 2010 at 03:43:07
I have called my ISP.They are said,my ip can't be changed with rebooting and others,only if i pull out my internet modem.And wait a long time to get another ip,with luck.Sometimes works,but i must wait a long time.I can change my ip only on this way,becas my fast internet technology disadvantage.((Sorry, my English was poor.))

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March 28, 2010 at 06:49:16
Buy a SOHO Router (small office/home office) that allows you to change (spoof) it's external MAC address.

My DHCP is like yours, my IP never changes unless the MAC of the device plugged into it changes.....or I have them make a change at their end like this last week when they upgraded me from the 3 Mbps package to the 6 Mbps.

Anyhow, with a router that allows you to change the external MAC you can get a "new" IP just by changing the external MAC on the router.

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