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Illegal User: A illegal user’s IP and MAC address pair matches an IP/MAC binding, of which the
Allow check box is unselected; or there’s only one of the IP address and MAC address that
matches the IP/MAC binding.
Undefined User: An undefined user’s IP address and MAC address are both different from any
IP/MAC binding. The undefined users are the rest of users except legal and illegal users.
It allows the legal users to access the Device and access the Internet through the Device, and
denies the illegal users. And the parameter of Allow Undefined LAN PCs determines whether it
allows the undefined users to access the Device and access the Internet through the Device, that is,
it will allow them if the Allow Undefined LAN PCs check box is selected, else block them.
IP/MAC binding feature can act on the packets initiated from the LAN hosts to the Device or outside
hosts. When receiving a packet initiated from LAN, the Device will firstly determine the sender’s
identity by comparing the packet with the bindings in the IP/MAC Binding List, and then process
the packet according to the sender’s identity, detailed procedure as follows:
1) If the sender is a legal user, the packet will be allowed to pass.
2) If the sender is an illegal user, the packet will be dropped immediately to prevent IP spoofing.
3) If the sender is an undefined user, there are two cases:
(1) If the Allow Undefined LAN PCs check box is selected, the packet will be allowed to pass.
(2) Else, the packet will be dropped immediately.
For example, if the IP/MAC address pair IP 192.168.16.65 and 00:15:c5:67:41:0f is added to the
IP/MAC Binding List, and its Allow check box is selected, see the following figure.
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