Linkskey LKR-604 - Manual (Page 47)

LKR-604
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MAC Address Control
MAC Address Control allows you to block certain client PCs from
accessing the Internet based on MAC addresses.
DMZ (De-Militarized Zone)
If a local client PC cannot run an Internet application properly from
behind the NAT firewall, open the client up to unrestricted two-way
Internet access by defining a PC as a virtual DMZ Host.