Can DHCP server be different from subnet?

Yes, you are right, configure different DHCP relay agents for clients in different subnets.

How does DHCP know which subnet?

The DHCP server uses the GIADDR-value to determine the subnet on which the relay agent received the broadcast, and allocates an IP address on that subnet. When the DHCP server replies to the client, it sends the reply to the GIADDR-address, again using unicast.

Does DHCP provide subnet?

In addition to the IP address, DHCP also assigns the subnet mask, default gateway address, domain name server (DNS) address and other pertinent configuration parameters.

Does DHCP server need to be on the same VLAN?

Each VLAN is a broadcast domain, so essentially you have to put a DHCP server on each VLAN.

When a DHCP server is on a different network than the DHCP client how does the DHCP server know from which scope to give the client an address?

Can you have two DHCP servers on the same subnet?

On the same subnet, you absolutely cannot run two DHCP servers that assign addresses from the same range. However, on the same subnet, you can have two DHCP servers that assign addresses from different ranges. You can run two DHCP servers on the subnet and let one distribute addresses .

What is DHCP subnet?

Dynamic Host Configuration Protocol (DHCP) plays a critical role in how users communicate on enterprise networks. Configuring a DHCP server to hand out IP addresses on a subnet is known as a DHCP pool. This pool of addresses is usually a range of consecutive numbers within a single IP subnet.

What is a DHCP subnet?

Can you have different subnets on same network?

Having more than one subnet on a LAN used to be more common than it is today. You can configure the router interface with a secondary* address. This will allow the router to be the gateway for both subnets, and it will be able to route between them.

What subnet would the DHCP server be on?

The DHCP Server would be on VLAN 2. On our Switches we would simple use the IP Helper or equivalent DHCP Relay command to point at the Ip Address of the Server. Upon the DHCP Server receiving the DHCPDiscover Message…how does it know what subnet to assign?

Can I have two DHCP servers on one network?

Bottom line, you CANNOT have two DHCP Servers on one network. There is no way to do this and it makes no sense. Was this post helpful? Thanks for your feedback! What you need is either long leases so that you don’t care about drops between buildings or put each building on its own subnet. Or static addresses in the “other” building.

Is it possible to have two buildings on the same subnet?

If you want to preserve your split-scope (for redundancy then the short answer is no. Same “no” applies even if you configure DHCP failover. If both buildings are on the same subnet then the DHCP broadcast will travel everywhere. If you decide to split the network into 2 subnets or 2 VLANs, then you loose your DHCP redundancy.

Is it possible to split the scope of a DHCP server?

The short answer was “not possible” because DHCP discover does not carry a quantifier that identifies the physical location of the client PC. One of the drawbacks of split-scope is that one scope might fill up quicker than the other. Because one DHCP server might be faster and closer to the majority of DHCP clients than the other DHCP.