Can you get a new ip address

jac006

Golden Master
Messages
5,810
Yes, all you need is a dynamic ISP and you can get a new one every time you log onto the internet. Or you can get programs that mask your i.p. address for you, like surfwatcher or something like that.
 

CrossCech

Daemon Poster
Messages
825
jac006 said:
you can get a new one every time you log onto the internet.

Got to be careful with that statement. If your ISP dynamically assigns addresses to its customers, majority of the time, you have an ip address for a specified period of time (leased) decided by the ISP. Yes, you might be able to force the issue with a ipconfig /release /renew ... but highly unlikely. It usually doesnt change EVERY TIME you log onto the internet.
 

AnonymousI

In Runtime
Messages
243
You can get a new IP address, but it rarely changes... I think it only changes when people join and/or people turn off their modem (Cable or DSL). Turning off the computer wont change the IP address. If you unplug or disconnect your modem from the phone or cable line, then the IP address is released for someone else to take.

ipconfig lists information about the network adapters. ipconfig /renew obtains the IP address from the modem since it is the first network device that connects to the ISP. ipconfig /release is used to "stop" network activity for the computer, but the IP address remains active on the modem.

To get a new IP, look at the DHCP lease expiration. When the lease expires, it automatically renews instantly, probably giving you the same IP again. To prevent that, you have to unplug your modem or disconnect the cable or phone line to the modem for a day or two after the expiration date.

<Edited for Clarification>
 

catalyst1

BSOD
Messages
2,734
Dial-up internet uses dynamic IP addresses. Also, I'm pretty sure that resetting your modem does not reset your IP address, but I don't know for sure. I'll test it out when I get home.
 

AnonymousI

In Runtime
Messages
243
My previous post, I was referring to DSL and Cable users... But dial-up users always have different IP addresses whenever they dial in.
 

catalyst1

BSOD
Messages
2,734
AnonymousI said:
But dial-up users always have different IP addresses whenever they dial in.
Right, that's what I was saying. And yeah, I just tested resetting my modem, and I get the same IP again. So not even resetting the modem changes your IP.
 

jac006

Golden Master
Messages
5,810
Actually, I find that if I turn my modem off and then on again, the i.p. is different (I have dsl).
 

CrossCech

Daemon Poster
Messages
825
AnonymousI said:
ipconfig doesnt renew nor change the IP address... ipconfig obtains the IP address from the modem since it is the first network device that connects to the ISP. ipconfig /release is used to "stop" network activity for the computer, but the IP address is still active on the modem.

Lets be clear on what ipconfig /release and ipconfig /renew does. These dos commands are used to actually release and renew ip addresses that are bound to a specific network adapter (ethernet NIC or wireless adapter). The ipconfig command by itself only LISTS the following information: IP address, Subnet Mask and default gateway. The ipconfig command alone does not "obtain any ip information from the modem". It does however obtain it from the NIC since it has been bound with TCP/IP protocol information.

However, as AnonymousI and most everyone else has pointed out ... simply using the ipconfig /release and /renew commands will probably result in obtaining the exact same ip addressing information as previously established. This is because of the leasing period established by the DHCP server of either the ISP via modem (not the modem itself, but a server at the ISP end) or a router.
 

catalyst1

BSOD
Messages
2,734
jac006 said:
Actually, I find that if I turn my modem off and then on again, the i.p. is different (I have dsl).
Hmmm, I have cable. Maybe it makes a difference? Or maybe it's just certain ISPs.
 
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