ZyXEL XGS4700-48F User Guide - Page 261
IP Source Guard
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CHAPTER 26 IP Source Guard Use IP source guard to filter unauthorized DHCP and ARP packets in your network. 26.1 IP Source Guard Overview IP source guard uses a binding table to distinguish between authorized and unauthorized DHCP and ARP packets in your network. A binding contains these key attributes: • MAC address • VLAN ID • IP address • Port number When the Switch receives a DHCP or ARP packet, it looks up the appropriate MAC address, VLAN ID, IP address, and port number in the binding table. If there is a binding, the Switch forwards the packet. If there is not a binding, the Switch discards the packet. The Switch builds the binding table by snooping DHCP packets (dynamic bindings) and from information provided manually by administrators (static bindings). IP source guard consists of the following features: • Static bindings. Use this to create static bindings in the binding table. • DHCP snooping. Use this to filter unauthorized DHCP packets on the network and to build the binding table dynamically. • ARP inspection. Use this to filter unauthorized ARP packets on the network. If you want to use dynamic bindings to filter unauthorized ARP packets (typical implementation), you have to enable DHCP snooping before you enable ARP inspection. XGS4700-48F User's Guide 261