NXC Series User’s Guide
198
CHAPTER 14
IP/MAC Binding
14.1 Overview
IP address to MAC address binding helps ensure that only the intended devices get to use privileged IP
addresses. The NXC uses DHCP to assign IP addresses and records to MAC address it assigned each IP
address. The NXC then checks incoming connection attempts against this list. A user cannot manually
assign another IP to his computer and use it to connect to the NXC.
Suppose you configure access privileges for IP address 192.168.1.27 and use static DHCP to assign it to
Tim’s computer’s MAC address of 12:34:56:78:90:AB. IP/MAC binding drops traffic from any computer
trying to use IP address 192.168.1.27 with another MAC address.
Figure 107 IP/MAC Binding Example
14.1.1 What You Can Do in this Chapter
• The Summary and Edit screens (Section 14.2 on page 199) bind IP addresses to MAC addresses.
• The Exempt List screen (Section 14.3 on page 201) configures ranges of IP addresses to which the NXC
does not apply IP/MAC binding.
14.1.2 What You Need to Know
The following terms and concepts may help as you read this chapter.
DHCP
IP/MAC address bindings are based on the NXC’s dynamic and static DHCP entries.
MAC: 12:34:56:78:90:AB
Bob
IP: 192.168.1.27
MAC: AB:CD:EF:12:34:56
Jim
IP: 192.168.1.27
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