Zyxel IES-1248 EE [215/544] Dhcp snoop

Zyxel IES-1248 EE [215/544] Dhcp snoop
IES-1248-51/51A/53 User’s Guide
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CHAPTER 30
DHCP Snoop
This chapter shows you how to set up DHCP snooping settings on the subscriber ports.
30.1 DHCP Snoop Overview
DHCP snooping prevents clients from assigning their own IP addresses. The IES-1248 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 IES-1248 forwards these
packets as well.
30.2 DHCP Snoop Screen
Use this screen to activate or deactivate DHCP snooping on each port. To open this screen,
click Advanced Application > DHCP Snoop.

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