3Com BR-6574N manual

3-3-4 Static DHCP Leases

If you wish to assign a fixed IP address to certain computers / devices by DHCP, you can use this function to establish a MAC-to-IP address table here, so you can assign a specific IP address to a specific computer / network device by its MAC address.

Here are descriptions of every setup items:

Item Name	Description
Enable Static	Check this box to enable this function,
DHCP Leases	otherwise uncheck it to disable this function.
MAC Address	Input the MAC address of the computer or
	network device (total 12 characters, with
	character from 0 to 9, and from a to f, like
	‘001122aabbcc’).
IP address	Input the IP address you want to assign to
	this computer or network device.
Add	After you inputted MAC address and IP
	address pair, click this button to add the pair
	to static DHCP leases table.
Clear	Click this button to remove texts in MAC
	address and IP address field.