Reserving An IP Address with DHCP

Most devices use DHCP, which assigns dynamic IP addresses, as a default. But sometimes you want devices to always have the same IP address.

For example, a wireless printer. When you print something, your computer and printer locate each other using IP addresses. If your printer’s IP address keeps changing, your computer may not always be able to find it. Giving your printer a static IP makes it so your computer always knows where your printer is.

Why use DHCP IP reservation

When you use DHCP IP reservation, you’re telling your Wi-Fi network to assign the same IP address to a specific device whenever that device connects to your network.

Example Router Configurations

Netgear

  1. Launch a web browser from a computer or mobile device that is connected to your router’s network.
  2. Enter http://www.routerlogin.net.
    A login window displays.
  3. Enter the router user name and password.
    The user name is admin. The default password is password. The user name and password are case-sensitive.
    The BASIC Home page displays.
  4. Select ADVANCED > Setup > LAN Setup.
    The LAN page displays.
  5. In the Address Reservation section, click the Add button.
    The page adjusts.
  6. In the IP Address field, type the IP address to assign to the computer or server.
    Choose an IP address from the router’s LAN subnet, such as 192.168.1.x.
  7. Type the MAC address of the computer or server.
    If the computer is already on your network, you can copy its MAC address from the Attached Devices page and paste it here.
  8. Click the Apply button.
    The reserved address is entered into the table.

    The reserved address is not assigned until the next time the computer contracts the router’s DHCP server. Reboot the computer, or access its IP configuration and force a DHCP release and renew.

Linksys:

Step 1: 
Access your Linksys cloud account.  For instructions, click here.

Step 2: 
Click Connectivity.

Step 3: 
Click the Local Network tab.

The Local Network tab contains two (2) sections: 

1.  Router Details

  • Host name – This is the router’s name.
  • IP address – This is the router’s IP Address.  

QUICK TIP:  You may change this address but you will have to reconnect devices currently connected to your router since it will have a different IP Address.

  • Subnet mask – This is the router’s subnet mask.  It’s used to divide a network into subnets so information can be routed correctly to your computers and devices.  Your Internet Service Provider (ISP) will provide you with the subnet mask setting needed here.

2.  DHCP Server

  • Start IP address – This is the starting IP Address given to the first device that connects to the network. 
  • Maximum number of users – This is the total number of devices that can connect to your router.  This number can’t be greater than 253 and by default is set to 50.
  • IP address range – The available IP Addresses that can be used on the network.
  • Client lease time – The amount of time (in minutes) a network user is allowed to connect to the router with their current IP Address.  When the time has expired, the user will be automatically assigned a new IP Address, or the lease will be renewed.
  • Static DNS 1 – 3  Domain Name System (DNS) is how the Internet translates a domain or website name into an Internet address or URL that you can access.  Your ISP will provide at least one DNS server IP Address.  You can enter up to three (3).
  • WINS – The Windows Internet Naming Services (WINS) is responsible for managing each computer’s interaction with the Internet.  If you use a WINS server, enter that server’s IP Address here.  Otherwise, leave this blank.
  • DHCP Reservations – This is where you can assign a unique, fixed IP Address to a specific device on your network.  This is helpful when you want your device to have the same IP Address every time it connects to the network.

Step 4: 
Under DHCP Server, click DHCP Reservations.

Step 5: 
This will show you the list of devices connected to your network.  Select the device you want to add and click Add DHCP Reservation.  

NOTE:  If the device you want to add is not listed, you can manually add a device to the DHCP Reservation list.  To do this, you will need to get the MAC Address of your device and then click Manually add device reservation to enter the following details:

  • Device Name – This is the name of the device you want to add.
  • Assign IP Address – This is the fixed IP Address it will get every time it connects to the network.
  • To: MAC Address – This is a unique identifier associated to a device.  To know how to get the MAC Address of your computer, click here.

Step 6: 
Click Save.

QUICK TIP:  You can click on Edit or Delete to configure your DHCP Reservation List.  Edit will allow you to change the Device NameAssign IP Address, and To: MAC Address.  Delete will remove the device from the list.

Step 7:
To save the changes you’ve made, click .

Your device will automatically get the assigned IP Address every time it connects to the network.  It will also no longer experience any IP Address conflicts with other devices in the network.

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