ZyXEL Communications IES-612-51A DHCP Snoop, 26.1 DHCP Snoop Overview, 26.2 DHCP Snoop Screen, Table, DHCP Snoop, Advanced Application, Figure 93 DHCP Snoop

26

DHCP Snoop

This chapter shows you how to set up DHCP snooping settings on the subscriber ports.

26.1 DHCP Snoop Overview

DHCP snooping prevents clients from assigning their own IP addresses. The IES-612-51A can store every (DSL port, MAC address, IP address) tuple offered by the DHCP server. Then, it only forwards packets from clients whose MAC address and IP address are recorded. Packets from unknown IP addresses are dropped.

26.2 DHCP Snoop Screen

Use this screen to activate or deactivate DHCP snooping on each port. To open this screen, click Advanced Application, DHCP Snoop.

Figure 93 DHCP Snoop

The following table describes the labels in this screen.

Table 56 DHCP Snoop

LABEL	DESCRIPTION
DHCP Snoop Status	Click DHCP Snoop Status to open the screen where you can look at or clear
	the current DHCP snooping table on each port (see Section 26.3 on page 192).
DHCP Counter	Click DHCP Counter to open the screen where you can look at a summary of
	the DHCP packets on each port (see Section 26.4 on page 193).
Port	This field displays each DSL port number.
Active	This field displays whether DHCP snooping is active (“V”) or inactive (“-”) on this
	port.

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IES-612-51A User’s Guide