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ZyWALL 110/310/1100 Series User’s Guide 241
CHAPTER 16
IP/MAC Binding
16.1 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 the MAC address it
assigned to 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 140 IP/MAC Binding Example
16.1.1 What You Can Do in this Chapter
•Use the Summary and Edit screens (Section 16.2 on page 242) to bind IP addresses to MAC
addresses.
•Use the Exempt List screen (Section 16.3 on page 244) to configure ranges of IP addresses to
which the ZyWALL does not apply IP/MAC binding.
16.1.2 What You Need to Know
DHCP
IP/MAC address bindings are based on the ZyWALL’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