Hawking Technology H-BR49 - Manual (Page 19)

Note that there may be more than one IP address from your ISP; select one
address and enter it in the corresponding field.
Figure 7
Device Configuration
Adapter Address
This field is grayed out because the
Adapter Address is not supposed to be
entered randomly. Do Not alter the
content unless you are sure it is
necessary to modify your MAC
address. To modify the address, check
Modify and enter the desired MAC
address.