ZyXEL Communications VPN Series - IP;MAC Binding; IP;MAC Binding Overview; What You Can Do in this Chapter; What You Need to Know

ZyWALL/USG Series User’s Guide
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CHAPTER 17
IP/MAC Binding
17.1 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 293 IP/MAC Binding Example
17.1.1 What You Can Do in this Chapter
•Use the Summary and Edit screens (Section 17.2 on page 419) to bind IP addresses to MAC
addresses.
•Use the Exempt List screen (Section 17.3 on page 421) to configure ranges of IP addresses to
which the ZyWALL/USG does not apply IP/MAC binding.
17.1.2 What You Need to Know
DHCP
IP/MAC address bindings are based on the ZyWALL/USG’s dynamic and static DHCP entries.
MAC: 12:34:56:78:90:AB
Tim
IP: 192.168.1.27
MAC: AB:CD:EF:12:34:56
Jim
IP: 192.168.1.27