What You Need To Know; Ip Source Guard - ZyXEL Communications GS2210 Series User Manual

• Use the ARP Inspection Configure screen
on the Switch. You can also configure the length of time the Switch stores records of discarded
ARP packets and global settings for the ARP inspection log.
• Use the ARP Inspection Port Configure screen
whether ports are trusted or untrusted ports for ARP inspection.
• Use the ARP Inspection VLAN Configure screen
inspection on each VLAN and to specify when the Switch generates log messages for receiving
ARP packets from each VLAN.

25.1.2 What You Need to Know

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.

25.2 IP Source Guard

Use this screen to look at the current bindings for DHCP snooping and ARP inspection. Bindings are
used by DHCP snooping and ARP inspection to distinguish between authorized and unauthorized
packets in the network. The Switch learns the bindings by snooping DHCP packets (dynamic
bindings) and from information provided manually by administrators (static bindings). To open this
screen, click Advanced Application > IP Source Guard.
Figure 144 Advanced Application > IP Source Guard
The following table describes the labels in this screen.
Table 88 Advanced Application > IP Source Guard
LABEL
Index
MAC Address
IP Address
Lease
Chapter 25 IP Source Guard
DESCRIPTION
This field displays a sequential number for each binding.
This field displays the source MAC address in the binding.
This field displays the IP address assigned to the MAC address in the binding.
This field displays how many days, hours, minutes, and seconds the binding is valid; for
example, 2d3h4m5s means the binding is still valid for 2 days, 3 hours, 4 minutes, and
5 seconds. This field displays infinity if the binding is always valid (for example, a static
binding).
GS2210 Series User's Guide
204
(Section 25.9 on page 218) to enable ARP inspection
(Section 25.9.1 on page
(Section 25.9.2 on page
219) to specify
221) to enable ARP