Chapter 15 Ip/Mac Binding; Ip/Mac Binding Overview; What You Can Do In This Chapter; What You Need To Know - ZyXEL Communications USG40 User Manual

15.1 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/USG uses DHCP to assign IP addresses and records the MAC address it
assigned to each IP address. The ZyWALL/USG 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/USG.
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 199 IP/MAC Binding Example
Tim
Jim

15.1.1 What You Can Do in this Chapter

• Use the Summary and Edit screens
addresses.
• Use the Exempt List screen
which the ZyWALL/USG does not apply IP/MAC binding.

15.1.2 What You Need to Know

DHCP
IP/MAC address bindings are based on the ZyWALL/USG's dynamic and static DHCP entries.
C
MAC: 12:34:56:78:90:AB
IP: 192.168.1.27
MAC: AB:CD:EF:12:34:56
IP: 192.168.1.27
(Section 15.2 on page
(Section 15.3 on page
ZyWALL/USG Series User's Guide
291
HAPTER
IP/MAC Binding
292) to bind IP addresses to MAC
294) to configure ranges of IP addresses to
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