It seems that every time Apple squashes one DHCP bug in iOS, another one pops up.
Dynamic Host Configuration Protocol (DHCP) is a system of automatically assigning IP addresses on a network, which mostly happens behind the scenes and without users noticing anything about it. Without an IP address, a device such as an iPhone, iPad, or any sort of computer cannot access the network.
DHCP uses a "lease" system where a computer can use a specific IP address for a certain length of time. In contrast to a static addressing scheme (where each device has a permanently-assigned IP address), DHCP allows many more devices to use the network -- as long as they are not all online at the same time.
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