Originally Posted by AnonymousI
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.