Single DHCP Server With Multiple VLAN Pools

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HP Procurve uses the same command, IP helper-address 111.222.333.444 as Ron mentioned is used for Cisco IoS. Cisco SMB switches like the SG300 use ip dhcp relay address 111.222.333.444. The list is endless really. That's not my purpose. I just wanted to add the "why" you need to use this command if you want to use one DHCP server for multiple VLANs/subnets.
We're doing this with Server 2003 where I am. The key is our central layer 3 device (in our case an old 3Com 4900 SX). It has what 3Com calls a "virtual interface" for each vlan. When dhcp requests arrive at the device from the outside it forwards them using same vlan interface they arrived on. The dhcp server just has a scope setup for each vlan with no other special configuration details. It matches the dhcp request to the originating interface on the layer 3 device to know which scope to use. That's out of the box behavior for the windows dhcp server.
The downside to this approach is that segment with your server must now be a member of all vlans (on the same virtual segment). This means all your broadcast traffic will now go up the fiber link to your main office (though not down all the other links to other branches), and it's nice to keep those links as clean as possible. It'll also use time on what is likely already your busiest local segment to reach your server. But this is probably unavoidable anyway.
While there may be reasons that you use multiple physical uplinks with untagged frames for communicating with different VLANs, a more efficient approach is to use Tagged VLAN frames on a single network connection. When you use tagged frames, the Windows Server tags the frames appropriately for each VLAN it is associated with. The ability to Tag frames generally needs vendor-specific driver sets to be loaded, such as the Intel Pro Set drivers using Intel-based cards.
The principles still apply to Windows Server DHCP servers running inside a Windows Server virtual machine. The one method that is more difficult is the tagging of a single interface with multiple VLANs as this is not a feature that you can carry out with VMware Tools drivers that I am aware of. You can add multiple virtual NICs to a single VM and connect the virtual machine to different VLAN-backed port groups for each connection.
DHCP server and DHCP client sould be in the same vlan to be able to communicate as the initial DHCP discover is a layer 2 broadcast packet to ff:ff:ff:ff:ff:ff MAC address. Cisco routers and layer 3 switches are able to act as DHCP relay and forward DHCP requests to a DHCP server located in another VLAN : a single DHCP server can now be deployed to deliver IP addresses to many subnet.
I have configured 3 VLANs: 1 (default), 2 and 3. They're dedicated to 3 separate /24 networks. Host on these VLANs are able to communicate with each other, and each subnets having their own DHCP servers, working as expected. I want to simplify and unify the DHCP administration to just use a single DHCP server, specifically the DHCP server of the switch. I have the DHCP server enabled with 3 address pools. I also created VLAN interfaces in each VLAN/subnet (not sure if this is required for DHCP to work in different subnets).
othohin - Your response would be true if you only wanted one VLAN to appear to your ESXi servers. Instead what you need to do is configure the network ports which are being used with the ESXi server running View to support "trunks" and not "access" VLANs. If you wanted to have say VLAN 10,11,12 visable to the ESXi server you would setup the trunk on all the ports used by the servers and allow all 3 vlans. Now in ESXi under "Network" configuration you would add a "Vitrual Machine" for each of the 3 VLAN, one for each of the vlan you setup above. Now when you setup our desktop image for View ma

Single DHCP Server With Multiple VLAN Pools

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