Quote:
Originally Posted by davidfor
For a home router, I would normally assume that it doesn't remember addresses across reboots.
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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.