The lease duration is how long clients should keep their IP addresses before having to renew them. There are a few considerations at this point. If a short lease duration is configured, clients will be renewing their IP addresses more frequently. The result will be additional network traffic and additional strain on the DHCP server. On the other hand if a long lease duration is configured, IP addresses previously obtained by decommissioned clients would remain leased and unavailable to future clients until the leases either expire or are manually deleted.
Additionally if network changes occur, such as the implementation of a new DNS server, those clients would not receive those updates until their leases expire or the computers are restarted. In an environment where computers are often moved and replaced, such as a wireless network, you would want to specify a short duration since a new wireless client could roam within range at any time. These are the other settings that help clients communicate on the network.
Specify the router IP address. The first option we can configure is the IP address for the subnet's router for which this scope is providing IP addresses. Keep in mind that this IP address must be in the same network as the IP addresses in the range that we created earlier. Configure domain name and DNS servers. Then enter When finished, click Next. If you had a DNS infrastructure in place, you could have simply typed in the fully qualified domain name of the DNS server and clicked Resolve.
The DNS servers will be used by clients primarily for name resolution, but also for other purposes that are beyond the scope of this article. Configure WINS servers. On the next screen, enter Finally, the wizard asks whether you want to activate the scope. At this point we almost have a functional DHCP server.
Certain network devices, such as networked printers, are best configured with reserved IP addresses rather than static IP addresses. This is similar to scope options except that these options are either inherited by all the scopes or overridden by them covered in ' Advanced DHCP Server Configuration on Windows ' article.
Earlier, we only defined exclusions for our servers, router plus a few more spare IP addresses. In case you need to exclude more IP addresses, you can do it at this point by following these instructions:. When the Add Exclusion window comes up, enter the required range and then click Add.
In our example, we've excluded the addition range Notice that the server node and scope node still has a red arrow pointing down. You will be asked to enter the name and description of your scope. The next window will ask you to define the range of addresses that the scope will distribute across the network and the subnet mask for the IP address. Enter the appropriate details and click next. You are shown a window in which you must add any exclusions to the range of IP addresses you specified in the previous window.
If for example, the IP address In this example I have excluded a range of IP addresses, In this case, eleven IP's will be reserved and not distributed amongst the network clients.
It is now time to set the lease duration for how long a client can use an IP address assigned to it from this scope. It is recommended to add longer leases for a fixed network in the office for example and shorter leases for remote connections or laptop computers.
In this example I have set a lease duration of twelve hours since the network clients would be a fixed desktop computer in a local office and the usual working time is eight hours. You are given a choice of whether or not you wish to configure the DHCP options for the scope now or later. If you choose Yes then the upcoming screenshots will be of use to you. Choosing No will allow you to configure these options at a later stage.
The router, or gateway, IP address may be entered in next. The client computers will then know which router to use. In the following window, the DNS and domain name settings can be entered. You can just input the server name into the appropriate box and press "Resolve" to allow it to find the IP address itself.
This issue can be caused by a network problem, or because the DHCP server is unavailable. When the DHCP server started and other clients can obtain valid addresses, verify that the client has a valid network connection and that all the related client hardware devices including cables and network adapters are working properly. In this case, the server may not be authorized to operate on the network.
These logs may explain why you cannot start the DHCP service. Skip to main content. This browser is no longer supported.
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