Operation Manual

GS1920 Series User’s Guide
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• Use the ARP Inspection VLAN Status screen (Section 26.8 on page 231) to look at various statistics
about ARP packets in each VLAN.
• Use the ARP Inspection Log Status screen (Section 26.9 on page 231) to look at log messages that
were generated by ARP packets and that have not been sent to the syslog server yet.
• Use the ARP Inspection Configure screen (Section 26.10 on page 233) to enable ARP inspection 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 (Section 26.10.1 on page 234) to specify whether ports
are trusted or untrusted ports for ARP inspection.
• Use the ARP Inspection VLAN Configure screen (Section 26.10.2 on page 235) to enable ARP
inspection on each VLAN and to specify when the Switch generates log messages for receiving ARP
packets from each VLAN.
26.1.2 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.
26.2 IP Source Guard Screen
Use this screen to go to the configuration screens where you can configure IPv4 source guard settings.
Click Advanced Application > IP Source Guard in the navigation panel.
Figure 156 Advanced Application > IP Source Guard
The following table describes the labels in this screen.
Table 96 Advanced Application > IP Source Guard
LABEL DESCRIPTION
IPv4 Source Guard
Setup
Click the link to open screens where you can view and manage static bindings, configure
DHCP snooping or ARP inspection and look at various statistics.