Zyxel VES-1616FE-55A [175/318] Dhcp snoop

Zyxel VES-1616FE-55A [175/318] Dhcp snoop
VES-1616FE-55A User’s Guide
175
CHAPTER 27
DHCP Snoop
This chapter shows you how to set up DHCP snooping settings on the subscriber ports.
27.1 DHCP Snoop Overview
DHCP snooping prevents clients from assigning their own IP addresses. The VES-1616FE-
55A can store every (ADSL 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.
In some cases, you might want to allow packets from an IP address not offered by the DHCP
server. This might apply, for example, when a device uses a static IP address. In this case, you
can specify the IP address whose packets are allowed, and the VES-1616FE-55A forwards
these packets as well.
27.2 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 102 DHCP Snoop

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