<div>
Have you checked the dhcp table to see if IP's are available for your switch to assign?
</div>


Have you checked the dhcp table to see if IP's are available for your switch to assign?

<div>
Are you running DHCP snooping on your switches?
</div>


Are you running DHCP snooping on your switches?

<div>
No that is not running on our switches.
</div>


<div>
On the server can you try to clear the ARP cache before a moved PC connects to the network - just as a test?<br />
<br />
<b>CMD</b> --&gt; <b>arp -d</b>
</div>


On the server can you try to clear the ARP cache before a moved PC connects to the network - just as a test?

CMD --> arp -d

<div>
Have you set a DHCP forwarder (ip-helper address) on the routing device(s)?<br />
Is DHCP working on the &quot;non-floor&quot; vlans, for the nodes that are usually on these VLANs?
</div>


Have you set a DHCP forwarder (ip-helper address) on the routing device(s)?
Is DHCP working on the "non-floor" vlans, for the nodes that are usually on these VLANs?

<div>
<div class="content wysiwyg-content">
Hello,<br />
We have five VLANs. One for each of our four floors and one for wireless. Oftentimes we will move computers to different floors (different subnets/VLANs). Whenever we do that, the PC is not able to pick up an IP from that floors VLAN using DHCP. The only way I can get it to work is by giving it an IP manually. This is not ideal. Is there any way to fix this? The switches we uses are Dell PowerConnect 5548 in a Windows DC environment. <br />
<br />
Thank You in Advance,<br />
ES
</div>
</div>


Hello,
We have five VLANs. One for each of our four floors and one for wireless. Oftentimes we will move computers to different floors (different subnets/VLANs). Whenever we do that, the PC is not able to pick up an IP from that floors VLAN using DHCP. The only way I can get it to work is by giving it an IP manually. This is not ideal. Is there any way to fix this? The switches we uses are Dell PowerConnect 5548 in a Windows DC environment. 

Thank You in Advance,
ES

DHCP Issues with Multiple VLANs

Networking software modules are interfaced with a framework implemented on the machine's operating system that implements the networking functionality of the operating system. The best known frameworks are the TCP/IP model and the OSI model. Systems typically do not use a single protocol to handle a transmission. Instead they use a set of cooperating protocols, sometimes called a protocol family or protocol suite.[9] Some of the best known protocol suites include: IPX/SPX, X.25, AX.25, AppleTalk and TCP/IP. Other protocols indirectly related to networking include the hypertext transfer protocol (HTTP) and its related technologies, Dynamic Host Configuration Protocol (DHCP), Domain Name Server (DNS) and other Internet protocols.

Networking Protocols

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.

Switches / Hubs

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

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