The DHCP Server Leases page is where you can view and manage static address allocations in the DHCP server. In addition to the static leases, this page also shows the currently allocated dynamic leases from the DHCP address pools, with the ability to Lock one or more of the corresponding clients to use a static lease.
The first part of the list shows the static leases (if any):
You can disable (rather than remove) a static lease if you are implementing a new address allocation scheme, or you are troubleshooting address allocation problems.
- IP Address
The IP address allocated to this client. Note that the IP address must be a valid address in the subnet of the specified interface.
- MAC Address
The MAC address which uniquely identifies this client.
An optional hostname for the client, in case the client requests a hostname from the DHCP server. Note that Windows clients are configured with a hostname (the Windows ID), so they do not request a hostname.
You can enter a comment further identifying this client (e.g. Color Printer), or you can add a note describing why a specific entry has been disabled.
- [Wastebin icon]
Press this icon to delete this static lease entry.
Important note: Even though you delete a static lease, the client will continue to use the same IP address until the client tries to renew the allocated IP address, typically within the next 12 hours. You should be aware that the client's valid lease will not appear on the dynamic leases list -- not even if the IP address belongs to the dynamic address pool. It is therefore recommended that you reboot the client (or by other means causes it to renew it's DHCP lease) after removing its static lease.
The second part of the list shows the currently allocated dynamic leases (if any) from the DHCP pools:
You can create a static lease for this client (with the listed MAC address) by checking this checkbox, edit the IP Address field, and press the button.
Note that if you change the IP address (recommended), the old dynamic lease is still listed, since the client will continue to use the old IP address until it tries to renew that lease (typically within the next 12 hours). On the other hand, if you do not change the IP Address (i.e. the client is statically allocated the current address from the DHCP address pool), the lease information will be discarded from the dynamic lease list. It is therefore recommended that you force the client to release and renew its DHCP lease if you create a static mapping for it.
This is the interface where this client is connected, and from which DHCP address pool it has been assigned a dynamic IP address.
- IP Address
The IP address allocated to this client. If you want to make a static lease for this client, it is recommended that you change it's address to an address outside the current DHCP address pool for this interface.
The hostname of this client, provided that the client has sent this information to the DHCP server. Note that Windows clients will send their configured hostname (the Windows ID) to the DHCP server.
This shows the date and time when the lease expires.
The following buttons are available: