i was wondering what actually causes wifi network connections to timeout. for instance, say my laptop is connected to my wifi and i yank the battery out such that my laptop can't send any proper 802.11 deauthentication frames. at which point will my router release whatever resources it had reserved for my laptop? is it when my laptop's DHCP lease expires? or are there 802.11 frames that serve as a form of heartbeat? or is it something completely different?