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I don't know why this happen. Everytime when windows dhcp server down, user lose ip right away. In the dhcp setting, the lease duration is 8 days. here is the screenshot. I am running server sbs 2011 <a href="https://filedb.experts-exchange.com/incoming/2012/07_w28/588887/dhcp.jpg" target="_blank" title="dhcp (76 KB)"><img alt="dhcp" class="file-block lazyload" style="max-width: 696px;" data-src="https://filedb.experts-exchange.com/incoming/2012/07_w28/588887/dhcp.jpg" /></a>
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dhcp.jpg

I don't know why this happen. Everytime when windows dhcp server down, user lose ip right away. In the dhcp setting, the lease duration is 8 days. here is the screenshot. I am running server sbs 2011 

User lose ip when DHCP server down

The Dynamic Host Configuration Protocol (DHCP) is an auto configuration protocol used on IP networks and an extension of the Bootstrap Protocol. DHCP allows for computers to be configured automatically to communicate with each other over an IP network without the need for manual setup by a network administrator. The implementation of DHCP relies on a DHCP server to hand out network configuration information to DHCP-capable clients that request an IP address (and other information required or useful in communicating with other devices on an IP network). In addition to an IP address, common configuration information served over DHCP includes a default gateway, subnet mask and DNS sever(s).

DHCP

Windows Server 2008 and Windows Server 2008 R2, based on the Microsoft Vista codebase, is the last 32-bit server operating system released by Microsoft. It has a number of versions, including including Foundation, Standard, Enterprise, Datacenter, Web, HPC Server, Itanium and Storage; new features included server core installation and Hyper-V.

Windows Server 2008

The Windows operating systems have distinct methodologies for designing and implementing networks, and have specific systems to accomplish various networking processes, such as Exchange for email, Sharepoint for shared files and programs, and IIS for delivery of web pages. Microsoft also produces server technologies for networked database use, security and virtualization.