ZyWALL USG 50 User’s Guide
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CHAPTER 20
IP/MAC Binding
20.1 IP/MAC Binding Overview
IP address to MAC address binding helps ensure that only the intended devices get
to use privileged IP addresses. The ZyWALL uses DHCP to assign IP addresses and
records to MAC address it assigned each IP address. The ZyWALL 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 ZyWALL.
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 205 IP/MAC Binding Example
20.1.1 What You Can Do in this Chapter
•Use the Summary and Edit screens (Section 20.2 on page 344) to bind IP
addresses to MAC addresses.
•Use the Exempt List screen (Section 20.3 on page 347) to configure ranges of
IP addresses to which the ZyWALL does not apply IP/MAC binding.
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
