Quote:
Originally Posted by compurandom
You'd think that, and you might think that restarting both the router and the device would make both forget the address. But either one can retain associations, and when a device renews its address, it can re-request the old one even if the router's dhcp server has forgotten and the device has been rebooted.
At that point, it's up to the dhcp server to decide if it will reissue the old address or give the new address. A good dhcp server would attempt to ping the old address before reissuing it. Sometimes the only way to force the address to change is to ban the dhcp server from passing it out somehow.
|
Many routers allow you to reserve internal IP addresses. So all you need do is tell the router that the given device is to retain the IP address. Also, many routers allow you to use a different MAC address and when you spoof the MAC address of the router, you get a new IP from your Internet provider. Then to change that, just remove this MAC address and use the router's MAC address. But wait a week and you'll then get another IP.
If your router cannot do any of these things, then your router needs to be replaced with a more capable router.