ZyXEL UAG4100 User Guide - Page 248
IP/MAC Binding
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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 UAG uses DHCP to assign IP addresses and records to MAC address it assigned each IP address. The UAG 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 UAG. Suppose you configure access privileges for IP address 172.16.1.27 and use static DHCP to assign it to Bob'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 172.16.1.27 with another MAC address. Figure 167 IP/MAC Binding Example MAC: 12:34:56:78:90:AB Bob IP: 172.16.1.27 Jim MAC: AB:CD:EF:12:34:56 IP: 172.16.1.27 20.1.1 What You Can Do in this Chapter • Use the Summary and Edit screens (Section 20.2 on page 249) to bind IP addresses to MAC addresses. • Use the Exempt List screen (Section 20.3 on page 251) to configure ranges of IP addresses to which the UAG does not apply IP/MAC binding. 20.1.2 What You Need to Know DHCP IP/MAC address bindings are based on the UAG's dynamic and static DHCP entries. UAG Series User's Guide 248
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