static dhcp assignment

Configuring Static DHCP You can configure the RV110W to assign a specific IP address to a device with a specific MAC address. To configure static DHCP: Choose Networking > LAN > Static DHCP . From the VLAN drop-down menu, choose a VLAN number. Click Add Row . Enter this information: Description Enter a description of the client. IP Address Enter the IP address of the device. The IP Address assigned should be outside the pool of the DHCP addresses configured. The DHCP pool is treated as a generic pool and all reserved IP’s should be outside this pool. Static DHCP assignment means the DHCP server assigns the same IP to the defined MAC address every time the device is connected to the network. The DHCP server serves the reserved IP address when the device using the corresponding MAC address requests an IP address. MAC Address Enter the MAC address of the device. The format for the MAC Address is XX:XX:XX:XX:XX:XX where X is a number from 0 to 9 (inclusive) or an alphabetical letter between A and F (inclusive). To edit the settings of a static DHCP client, select the client and click Edit . To delete a selected DHCP client, click Delete . Click Save to apply changes.

How-To Geek

How to set up static dhcp so your computer's ip address doesn't change.

DHCP makes it simple to configure network access for your home network, and port forwarding makes it easy to those computers from anywhere.

Quick Links

The problem with dhcp and port forwarding, finding your mac address, dd-wrt and static dhcp.

DHCP makes it simple to configure network access for your home network, and port forwarding makes it easy to those computers from anywhere. By configuring static DHCP on your router, you can combine the best of both worlds.

DHCP is great. You configure your router to automatically assign IP addresses and the computers on your network just plain work. Port forwarding is useful because you can access your router from outside of your network and be redirected to the computer you need inside of your network. The problem is that these two wonderful things rely on one premise: your internal IP addresses don’t change. If your router changes the IP that is assigned to a machine by DHCP, then you have to reconfigure Port Forwarding. Many programs try to get around this fact by offering Universal Plug and Play (UPnP) port forwarding features, but not everything does.

Newer routers often have the ability to remember which IP address was assigned to which computer, so if they disconnect and reconnect their IP doesn’t change. Often, though, a router reset will wipe this cache and start assigning IPs on a first-come, first-served basis. Tons of older routers don’t even have this ability, and immediately assign new IP addresses. With IP addresses changing, you have to reconfigure your port forwarding settings often, otherwise you may lose the ability to connect to your home computers.

You can do this on plenty of modern routers, but we're going to use DD-WRT for this guide. We’ve touted DD-WRT’s ability many times before, and it’s not for nothing. This amazing custom router firmware has a solution to this mess: static DHCP, also known as DHCP reservation. While configuring your router for DHCP, you have the ability to enter the MAC addresses of your computers’ network cards and enter which IP address to assign them. DD-WRT will automatically take care of the rest! If you have a different router, you can try following along using your router's own admin page--the instructions should be somewhat similar.

The only real work you’ll have to do is find the MAC address of each computer’s attached networking card. If you’re using wireless then you should find the MAC of your wireless card, and if you’re wired then use the Ethernet card.

Just go down to the icon in your system tray for your connection and click it. Mine is wireless.

Right-click on your current active connection and click on Status.

Click on the “Details…” button.

Your MAC address for this device is listed as “Physical Address.”

OS X users can check under their System Settings and click on Network. If you click on the various tabs for your connection, you should find a “Physical ID,” “Ethernet ID,” or “MAC Address.” Ubuntu users can type “ifconfig” in Terminal. You’ll see various network adapters, each displaying its own hardware address. Do this for all of the computers in your network that you need port forwarding for. The others will just get their IPs assigned automatically by DHCP.

Now that you have a list of MAC addresses for each of your computers, open up a browser tab and head over to your router’s DD-WRT interface. Click on Setup, and under Basic Setup, make sure DHCP is turned on.

Scroll down to “Network Address Server Settings (DHCP)” and make a note of the starting IP address and the maximum number of users. The addresses you configure should fall within this range. Here, my range of IPs would be 192.168.1.100 – 192.168.1.114.

Now, click on the Services tab up top.

Under the DHCP Server section, you can see that there’s a list of “Static Leases” click on the Add button to add a new one.

Enter the MAC address of each computer, give each one a name so you know which is which, and then assign them an IP address. You won’t be able to add the same IP address to two different MAC address, so make sure each MAC has a unique IP. If your version of DD-WRT also has a space to enter the “Client Lease Time,” a safe setting would 24 hours, or 1440 minutes.

That’s it! Be sure to click on both the Save button and the Apply Settings button, and wait for the changes to take effect. The settings should automatically change when each computer’s lease expires, though you can reconnect from each computer if you want the changes to take effect immediately.

Now, whether your computer loses its connect, the router gets power cycled, or the DHCP lease expires, each computer you entered into the list will stick to its assigned IP. Furthermore, you won’t have to manually configure static IPs on each machine! Port forwarding won’t have to be a pain ever again.

Does your router support DHCP reservations? Do you have a more clever use for this system? Share your thoughts in the comments!

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What does static DHCP mean? Static Dynamic is confusing

I've found some home wireless routers/ADSL+ modems (ZyXEL 660) talking about Static DHCP, when refering to assosiating a specific MAC to an IP, but still serve the configuration over DHCP.

Doesn't this have another name? What does Cisco call this feature (that I know supports because I've used long time ago)?

• home-networking

4 Answers 4

A DHCP reservation. Cisco refers to it as "Static DHCP".

More information here . (See "Manual allocation").

• beat me by 36 seconds...so you get a +1 for quick response ;-) –  Avery Payne Jul 15, 2009 at 21:16

You're talking about a DHCP reservation. This is actually a common feature but little-known by most folks. It's quite useful for locking an IP address to a machine, but wanting to keep centralized control over its settings for DNS and default gateway, etc. Very useful.

My router calls it IP-MAC binding

Also heard it refered to as DCHP reservation

Static DHCP : Static DHCP is where you can specify the MAC address of any machine in DHCP server so that PC with stated MAC address will always get the same IP address from DHCP server because MAC address is bound with IP Address in DHCP server.

Dynamic DHCP : here no Bind of MAC address and IP address so when a user newly request for IP address from DHCP server he will get new IP address on each request.

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Static Mappings Inside DHCP Pools ¶

While the ISC DHCP daemon will allow a static mapping to be defined inside the DHCP range/pool in its configuration, doing so can result in unexpected behavior.

A static mapping entry in the ISC DHCP daemon is not a reservation and it does not remove that IP address from the pool. The daemon only checks via ICMP ping to ensure that an IP address is not actively in use when making assignments. The static mapping only represents a preference for IP address assignment and it does not prevent the daemon from assigning the IP address to other client devices when it is not actively in use by the intended device defined in the static mapping.

Example: The DHCP configuration contains a pool from 192.168.0.10 to 192.168.0.250 with a static mapping defined for 192.168.0.25 . If the device which normally has 192.168.0.25 is ever offline another device could be assigned 192.168.0.25 in its absence. When the original client device reconnects it will not be able to get 192.168.0.25 because it is currently in use, and will instead receive another random address from the pool.

Due to this behavior the best practice is to only make assignments outside the range/pool and the GUI enforces this practice.

If a use case requires assignments inside the pool and the administrators do not care about the risks involved and want to do so anyway, the input validation check can be removed from the PHP file that drives the DHCP editor page. The details of this unsupported change will not be covered in documentation.

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Configuring static dhcp ip addresses for dhcp snooping (els), configuring static dhcp ip addresses for dhcp snooping (non-els), configuring static dhcp ip addresses for dhcp snooping (mx routers), configuring static dhcp ip addresses.

This task uses Junos OS for EX Series switches with support for the Enhanced Layer 2 Software (ELS) configuration style. If your switch runs software that does not support ELS, see Configuring Static DHCP IP Addresses for DHCP snooping (non-ELS) . For ELS details, see Using the Enhanced Layer 2 Software CLI .

You can add static (fixed) IP addresses and bind them to fixed MAC addresses in the DHCP snooping database. These bindings are labeled static in the database, while those bindings that have been added through the process of DHCP snooping are labeled dynamic . Static IPv6 address assignment is also available for DHCPv6. This feature is supported on aggregated Ethernet interfaces.

Before you can perform this procedure, you must configure the VLAN. See Configuring VLANs for EX Series Switches with ELS Support (CLI Procedure) .

To configure a static IP address to MAC address (IP-MAC) binding in the DHCP snooping database, you must first create a group of access interfaces under the [edit vlans vlan-name forwarding-options dhcp-security ] hierarchy. Creating this group automatically enables DHCP snooping, which is a prerequisite for creating the DHCP snooping database. On switches that support DHCPv6, creating the group of interfaces will automatically enable both DHCP and DHCPv6 snooping. Then you can configure a specific interface within the group to have one or more static IP-MAC address bindings.

To configure a static IP-MAC address binding in the DHCP snooping database:

• [edit vlans vlan-name forwarding-options dhcp-security] user@switch# set group group-name interface interface-name static-ip ip-address mac mac-address

To configure a static IPv6-MAC address binding in the DHCPv6 snooping database:

• [edit vlans vlan-name forwarding-options dhcp-security] user@switch# set group group-name interface interface-name static-ipv6 ip-address mac mac-address

In the following example, a device with static IP allocation is connected to the ge-0/0/1 interface, which belongs to vlan-A. To configure this device to connect to the external network:

To verify that the configuration is configured on the device:

To verify that a binding entry is created for the static client:

• show dhcp-security binding
• Enabling DHCP Snooping (non-ELS)
• Understanding DHCP Snooping (non-ELS)

You can add static (fixed) IP addresses and bind them to fixed MAC addresses in the DHCP snooping database. These bindings are labeled static in the database, while those bindings that have been added through the process of DHCP snooping are labeled dynamic .

This task uses Junos OS for EX Series switches that do not support Enhanced Layer 2 Software (ELS) configuration style. If your switch runs software that does support ELS, see Configuring Static DHCP IP Addresses for DHCP snooping (ELS) . For ELS details, see Using the Enhanced Layer 2 Software CLI .

To configure a static IP-MAC address binding in the DHCPv6 snooping database:

To view results of the configuration steps before committing the configuration, type the show command at the user prompt.

To commit these changes to the active configuration, type the commit command at the user prompt.

• secure-access-port

You can add static (fixed) IP addresses and bind them to fixed MAC addresses in the DHCP snooping database. These bindings are labeled as static in the database, while those bindings that have been added through the process of DHCP snooping are labeled dynamic .

To configure a static IP address/MAC address binding in the DHCP snooping database, you must first create a group of access interfaces under [edit bridge-domains bridge-domain-name forwarding-options dhcp-security ] . Creating this group automatically enables DHCP snooping, which is a prerequisite for creating the DHCP snooping database. The following procedure shows the configuration in two steps, but it can be done in one. You can then configure a specific interface within the group to have one or more static IP-MAC address bindings.

To configure a static IP address and MAC address binding in the DHCP snooping database:

• Create a group by including an access interface: [edit bridge-domains bd-name forwarding-options dhcp-security] user@device# set group group-name interface interface-name
• Configure a static IP address: [edit bridge-domains bd-name forwarding-options dhcp-security] user@device# set group group-name interface interface-name static-ip ip-address mac mac-address

pfSense 2 Cookbook by Matt Williamson

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Creating static DHCP mappings

This recipe describes how to add static DHCP mappings in pfSense. A static DHCP mapping ensures a client is always given the same IP address.

Getting ready

Creating static DHCP mappings is only applicable for interfaces using the DHCP service.

How to do it...

• Click the “plus” button to add a new static DHCP mapping.
• The MAC address will be pre-filled.
• Enter an IP address , which must be outside the range of dynamically assigned DHCP addresses.
• The Hostname may be pre-filled. If not, enter one.
• Enter a Description .
• Save the changes.

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DHCP IP reservation or Set a Static IP address for a device

To get the most out of Google Home, choose your Help Center: U.S. Help Center, U.K Help Center , Canada Help Center, Australia Help Center . 

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.

Why use DHCP IP reservation or Static IP

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 address ensures that your computer always knows the address of your printer as it won’t change if it’s rebooted or if a DHCP IP lease expires.

• You'll need DHCP IP reservation (Static IP for your client) if you want to set up port forwarding to that device.
• You can customize the subnet you use under LAN settings (if you prefer to use a different subnet).
• This article applies only to local devices connected to your router (laptop, smartphone, tablet, etc.). They can have static IP addresses that only your router sees. The outside world won’t see these static IP addresses. But your router can also have a static IP address that the rest of the internet sees. Learn about Static IP for your Wifi point’s WAN .

Change your DHCP settings

• Tap the device for which you’d like to assign a static IP.

Note : You may need to disconnect this device from your Wi-Fi network and reconnect it before it is assigned the reserved IP.

Need more help?

Try these next steps:.

Get an answer from an expert on the Google Home Help Forum.